I asked a question about 7 months ago but unfortunately I'm still having health issues. I stil haven't had intercourse since April and no new exposures. 

I have seen an immunologist, PCP, rheumatologist, infectious disease, and a neurologist and no one can find the root cause. I'm still having contant chills and hot sweats without a fever, intense flushing, intermittent nerve pain, double vision in my right eye, and fatigue. I now have thrush and my immunologist said my t cells are not working properly even though my CD4 count is 1000. My CD8 count is 278. It seems like my b cells are fine. I will need to start fungus medication for preventation of infections soon. I started taking jakafi a month ago to treat PV but that hasn't resolved my symptoms. 

My doctors have tested me for autoimmune, infections, stds, and endocrine issues and everthing has been normal. All of my inflammation markers have been normal as well. (ESR, CRP). I have also had a lumbar puncture and MRI/CT scans with nothing remarkable.

I have had multiple PCR and 4th Gen HIV tests from 2 weeks to 7 months. My last PCR test was 6 months (October) and my last 4th gen test was 7 months (November) and both are negative. 

Is it medically possible to test negative at 7 months and still have hiv? Have you ever seen anyone test postive this late or post 7 months? I would assume if someone had a comprised immune system their viral load would be high and be caught by a PCR test.

I have seen a few cases on the internet where people didn't seroconvert for a year plus. Is that possible? Would everyone develop antibodies by 7 months even if they were severely immunocompromised?

Is it medically possible I could have hiv with all of the tests I have done?

"I have seen a few cases on the internet where people didn't seroconvert for a year plus. Is that possible?" No it is not -- not with the test results you have had. Such reports are from distant past tests for HIV no longer in use.