I do not believe I am bipolar. My father was bipolar and my mood swings are nothing like that.
My mood swings are mostly depression and/or PTSD. However, I'm not sure I am labeling "depression" correctly. My depression always hits abruptly with no apparent connection to anything. I just suddenly feel that a profound disaster has occurred, as if I just witnessed a loved one killed by a bomb or building explosion, etc. It is a feeling of urgency and profound loss, but it is not connected to anything. It is very hard to be or act happy with that feeling. It persists for a few days to a few months. It is also inhibiting in daily life including work. I have had this all my life, as far back as I can remember. It doesn't seem to have a schedule, or at least not one that I have ever been able to track. It seems to occur anywhere from two to several times per year.
I think I have figured out my PTSD, which started in childhood. The PTSD is triggered by country and western music or anything along that line including blue grass, some folk music, etc. Basically, it is triggered by anything to do with cowboys or that lifestyle. the sight of a cowboy hat is extremely uncomfortable. I have figured out the source, but it is too painful to write about. Upon a trigger, I will frantically bolt at full speed. The best example I have seen of how it makes me feel is portrayed in the true story move titled, "Welcome to Marwen". It is a true story of Mark Hogencamp's PTSD experience. Here is a
clip from the movie, though as a standalone clip, it doesn't have the impact without the rest of the movie. I'm not sure if the PTSD is related to autism, but I believe it is, because I am certain the condition of its origin is autism related.
Apart from the depression and PTSD, I do not think I have mood swings. I'm never numb. I have sensitive feelings, that can be uplifting or upsetting, but it's never connected to the depression.