When you are 100% sure that the condom didn't fail, then there is no reason to be scared of HIV. Again, it seems like you are high on anxiety which also causes sores in mouth. Anxiety can cause so many real physical symptoms, you could never have imagined. Regarding the folliculitis, it's not a sign of HIV. It's very common on the thighs because both of your thighs inner skin rub with each other while walking. The also get in frictional contact with your trousers, so they are pretty common. That's not at all a concern. You are absolutely fine. However, if you had unprotected oral sex, then you should have got the std panel test, just to be sure. But when the professional medical specialists denied for the tests, there must be some reason.
However, if you are not able to get control of your anxieties, it's better to get tested and seal those irrational fear under the earth one and for all. As the incident was 7 months old, you may choose any hiv test and it willl be conclusive at one go. All the best..