IMHO
the way i figured it out was first, what others said, to have a thyroid function test. mines a little hypo so am on meds for it, but it didn't explain anything and didn't override any MI).

As far as ADHD, if i take anything even remotely resembling "speed", even caffeine or energy drinks, i climb up every tree on the block, it didn't have the result of calming me down like ADHD meds do...was just the opposite.

then, even tho the anti-depressants when first dx'd with depression helped, i still got manic (who tells the docs tho when you're high on life and feeling great?! altho switching jobs, spending money u don't have, moving every year, traveling and wondering why the heck u did that...<sigh>). i finally found a great pdoc that caught the bipolar disorder as opposed to the anti-d causing mania (some--the SSRIs?--do) and put me on an antipsychotic for the mania. (i have to have the anti-d...the lows are too deep into the abyss.)

there's also a mix of anxiety, PTSD and d.i.d. in this ole head too, so i also take a benzodiazepine (valium) for my "nerves" when things get too tense or stressful.

i still have mood swings but not so wild, and i have my pdocs ok to raise my seroquel as needed at those times (please, do not try this at home!)

anyway, (should have just said this to begin with!) a good pdoc can tell, and do the right tests, maybe have your reg doc do the thyroid blood work or pdoc can order it?, and the pdoc can give you written tests to rule out other disorders, as well as being a good listener to pick up what's really going on.

just my experience (took several years, but that's what finally came out of it all), i hope this helps you.