Hey cn,
It's quite possible you have AVPD or even SAD. There are things you talk about when you're out in public that I can totally relate to. One time you said when you hear people laughing you wonder if they're laughing at you. I asked my therapist about this and she said it is normal if people have done so a lot in the past.
The racing thoughts with SSRI's are totally normal. They are known to improve
mood but can make
anxiety symptoms worse. It's a catch 22

What docs do around here is add a mood stabilizer like gabapentin on top of the antidepressant.
Honestly the only thing that truly kills my anxiety are antipsychotics, however I don't like taking them too much as they can cause TD. But a low dose annihilates my anxiety if i take it as a PRN.
Cyclothemia is interesting because my psychiatrist told me that I have a possible case of BP 2 and she is monitoring me for it. A lot of people think that hypomania is simply mood elation and that's not true. Significant irritability, racing thoughts, agitation can be hypomania too. I had agitated depression and mixed episodes in the past and it is NOT FUN!
Racing thoughts can be anxiety but if youre having other symptoms such as agitation or irritability you should get screened for any of the three bipolar disorders.
Best of luck