Given all this- I think you should be seen by a doc.
The blisters on hands, mouth ...and if feet as well can be a common virus we see most often in kids- called Hand, Foot and Mouth Disease- it is a virus and goes away all by itself.
But w. vag pain and painful urination, you need an exam and urinalysis.
He can only give you genital herpes via oral sex if he gets cold sores and has one now..... But if your sex is unprotected, you probably have been exposed anyhow, right?
The blisters on the hands should be looked at- given your Immune deficiency, that opens the door to many bugs. Although the things that cause this are the dyshidrosis I mentioned previously (palm doesn't have to be involved) and scabies, which would itch intensely and spread, and not come and go.
All in all--- with the IgG issue, I don't feel comfortable making a possible stab at what is going on beyond this. Chlamydia can be passed back and forth, and can do a lot of internal damage to you- so you need to go get checked and tested anyhow.
And- with all these STDs, I hope you have been HIV tested as well. Regularly.
GO see a doc. Today!
Any other questions I will do my best- but you have too many variables that could cause big problems for you- and in this kind of forum, we can't test you or examine you, and that is what you need most.
and do the safe thing and see your doc.
My best and warm regards---