So, I deal with a lot of issues that sound very much like what you're describing, particularly the headaches.
My own symptoms are:
1, headaches. These seem to arc sort over the top of my head and into my eye. I must say, I do not find these fun.
2. My right arm flares up a lot. Things like too much mouse use can do it, or a variety of other things. When flared up the pain is very intense.
3. Both my neck and my lower back can "lock up". Basically, I cant turn while in that state. Well, no... it's not that I technically cant. It's that it hurts so bloody much to do so that there's little point in trying. All I can do is wait... usually a day or two... until it wears off. This pain is not random though, it is triggered by something.
4. A variety of pain types along my spine, and also in my shoulders, particularly on the right.
Now, here's something I learned very early on with this stuff: going to just a normal doctor isnt enough. I'd STRONGLY suggest seeing a specialist (not a chiropracter, and I'll get to that in a moment). My own problems are both nerve and tendon related, and some of what you described sounds like nerve issues too.
What helped me isnt some magic medication or quick procedure... that's not how this worked. What helped me is physical therapy. But it takes a bit to get there.
Firstly, you need to get a PROPER examination... again, by a specialist... to determine the actual source of the problem. It may not be where you think it is. Like, when I have pain down in my hand, right. The problem isnt down there. That's not where the pain is coming from... that's just where I PERCEIVE it. It's actually coming from both my elbow, and up near my neck as well. "Referred" pain is one of the effects that nerve/tendon issues can bring, and it's typically the most frustrating.
It's the same with headaches. The pain, where I described it, isnt where it actually comes from for me. It's actually coming from a couple of small spots at the very back of my neck. That it shoots up over the top of my head is just the referred pain, not the actual location.
The reason I say not to go to a chiropractor is that the causes for this can be many, and the absolute #1 thing you DO NOT WANT TO FREAKING DO is pull/yank/twist/bend the wrong spot. And those four things are pretty much what chiropractors do, when you think about it.
But also... there's just no magic cure for this. You want a fix, you're likely going to have to work for it.
In my situation, what happened was, it started with an MRI, right. This was used to determine the nature of the pain. The type of cause, I guess. And also to rule out any more dangerous problems.
After that though, comes PT, or physical therapy. THAT is the one and only thing I've found that is effective. But it's not a magic cure, it's not a "WELL LET'S JUST YANK YOUR ARM PAST YOUR BUTT, THERE THAT'LL FIX IT" sort of quick fix. It's work. It's hard work. The point isnt just to relieve the pain: it's also to strengthen specific areas to make them more resistant. As well as to keep certain areas moving enough that you're less likely to tighten up, that sort of thing.
But also, some problems cannot be solved by the type of approach a chiropractor uses. Simply adjusting your spine and whatnot (which is what they do) can often have absolutely no effect whatsoever on the current issue. Or can just make it worse. And trust me, you do NOT want to mess with the level of pain that can happen if you screw that up. Whatever you're feeling now, it's nothing compared to what you'll feel if you get THAT wrong. So... yeah. Dont do that.
My own therapist frequently does something I usually refer to as "prodding". I'm not sure how else to put it. Basically it's like someone jams their fingers into your side/whatever REALLY hard, and pushes against that spot. It's not about just the joints, it's about the tendons as well.
That stuff, the procedures they do for me directly, combined with the exercises they give me, are what helps.
I'll put it this way: I had a period of about two years where I couldnt use a freaking mouse. Why? Because my arm would flare up bad every time. I actually used a game controller to EMULATE the mouse in order to bypass that issue. Because what else was I going to do?
Now though? Really not too much of a problem as long as I dont go totally overboard. I can use one now like I used to. But it's because of the work done in PT, over time.
But this is going to differ from one patient to the next, and that's exactly why you need a specialist to properly examine and diagnose, and also why the process is slow to do, done over a long period of time rather than in a couple of quick spine-mangling appointments.
Seriously: Take it slow, take it careful, see a real specialist, get fully examined. And then go from there.