Thanks for you query.
You have got diarrhoea
for more then a month and fatigue
plus rashes. it is a regular protocol to get viral markers done when any such complaints are present . so you need not worry about that. You have not mentioned any history in your query that puts you in a high risk category for having HIV
. The test is generally done by ELISA
method and it is confirmed by western blot testing . other methods like PCR are also used. so , you go ahead and get the tests done.
Wish you a good health.