Skin Problems - seb derm and rosacea due to STD?

this may end up being a lot to read but please help...im extremely worried....

im a 24 year old male. ive always had very fair and sensitive skin. when i was younger i had bad eczema on my feet, but that cleared up. other than i've never had any real skin problems until recently. let me say that in the past 6 months or so, i've been partaking in some careless activites with some questionable females. it was always oral sex (always recieving, never giving), but i never wore a condom. the females i did these activities with were very questionable. i know it was stupid, so lets please not get into that. in the past few months i've been developing lots of skin problems.

here are some of the symptoms....keep in mind that i've never had a problem with any of these before recently.

-very oily skin, especially on my forehead
-acne- mostly on my face but am now getting pimples on my bak sohulder and even pimples on my arms and hands
-seborrheic dermatitis (very itchy on my face and scalp)
- small painful bumps under my eyebrows and on my scalp
-red bumps and spots on my chest
-keratosis pilaris
- generally itchy body. im constantly feeling faint itchiness all over my body.
-just today i noticed small red patches near my hand. they are little red spots that dont really look like pimples. there are 4 of them near my wrist.
- a little hair loss in my eyebrows

i went and saw a dermatologist and she said it was seb derm and a little rosacea (ive been blushing everytime im in the sun). she gave me a couple of prescriptions that im going to start tomorrow.

what worries me is the fact that all this is happening at once. my face is an aboslute mess. it's red with pimples andflaky skin everywhere. my pores are huge and the skin is very oily. i've been avoiding people because of how terrible it looks. why would this all happen at once? thats why im worried about hiv. even though i only had oral sex and not vaginal, it wouldn't surprise if one of these girls was infected. i am going to get tested but wont get a chance for another few days.

do these sounds like common symptoms of hiv? should i be worried? please give me some opinions. thanks