I have a hard time noticing when i dont have much social energy left or things are too much until its too late.
This leds to lots of meltdowns and sensory overloads. The more i mask the worse it gets.
Any ideas what i could do to notice these things more early?
I've struggled with this too. I work in a coffeeshop, and it can get really busy. I have substantial hearing loss, so don't have to explain that working on till and speaking with customers is less than ideal for me, but even just making drinks and food I can reach a point in a busy day where I just absolutely shut down- thankfully it's usually near the end of my shift but it can get overwhelming, and has definitely resulted in some embarrassing experiences. If you struggle with identifying your needs in general (when you're hungry, thirsty, tired, etc), I have found recently that taking breaks to "use the washroom" or "do the dishes", and other excuses to get away from people allows me to recharge a bit before my energy reserves are depleted and also gives me some time to check in with myself. I struggle with identifying these needs, so I'll try to do a bit of everything- drink some water, eat a little something if I can, stim in any appropriate ways, and use breathing exercises to help with anxiety management- I've also found this helps calm my mind down to a point where I can sometimes identify the needs that would have otherwise just felt like an unidentifiable lack of something.
I would also suggest just masking less if you are in environments where it is physically and emotionally safe for you to do so. For example, if you mask your stims, and are worried about people seeing you in a particular way because of them, there are many stims that are more normalized for neurotypicals, like humming, pencil tapping, knee bouncing- I started making a real attempt to reduce how much I mask at work and it has helped me a lot. Last summer I was new to the job, and was worried about fitting in, so hid anything that would set me apart but when i got home I would be such a mess that my first means of regulation was being violent against myself, like pulling my hair, hitting my legs, trying to break my phone in half with my bare hands, etc. It's a bit funny thinking about it now because the fix was so easy but it was exhausting at the time. I don't do all of my stims, at least not intentionally, but I do hum, talk in accents (French, and posh British mostly, because people don't think i'm trying to offend anybody), etc. I also wear a mask at all times- it is no longer mandatory where I live, but I have found it helps me a lot as I don't have to force facial expressions to appease others feelings as much. If you have object obsessions I would suggest bringing some of those with you too! I like neat rocks, so have at least 3 in my pockets on a daily basis, and I also wear a good deal of jewellery to fidget with. A small notebook to get out thoughts can also be a helpful means of identifying your needs. At work this may be easier if you have designated breaktimes, but if people know about your diagnosis and you can explain your experience, it shouldn't be a problem to request short breaks so you can regulate. My sister isn't on the spectrum but gets bad anxiety and uses maintaining her duolingo streak as a reason to excuse herself to learn spanish in the washroom, lol.
I am also going to say that I agree with other responses about the importance of sleep- I also have ADHD and can have struggles with sleep, but it maybe makes the most significant difference in my ability to regulate emotions and energy.
Sorry for the lengthy response- it's just been something I've been thinking about a lot myself lately!