Could it be parasites?

Hey guys,
I am writing to you becaus I am rather curious abuot your opinion.
Here is the thing:
Around 8 months ago a sexual misadventure I caught something.
I am saying a something, because no pathogen has been found, even though I have been tested thoroughly for STDs, all came back negative.

Here are my symptoms, without being too graphic:
First my groin got itchy, this itchiness spread then to my neck and legs, then this faded out. Then I started to feel this weird pain in my penis, the skin got brittle and dry and something really wasn't all right.
Then I started experiencing strange sensations, quick flashes in my prostate.. in my core.. lasted for a day or two then disappeared.
A week or two in I started to get bruises and scarring as 1-2 centimeter straight lines in my left upper arm and right thight.
The bruising with the tiny scars was travelling further and further down my left arm.. and eventually faded out around my wrist.
This was also the time when tiny hyperpigmented spots appeared on both my arms. First these were red, then turned slowly brown.

//Fastforwarding to today//

Now I know that I have suffered peripheral neuropathy in my hands and have developed a type of artiritis as well..
The bruising is pretty much gone now, my genital area quite well recovered.. but I am left with this spondarthritis, some involuntary muscle cramps here and there, purplish nail beds and some tiny hyperpigmented spots (like tiny moles) appearing over my body. My forearms were almost entirely white, now I have these dots on both.

My question is ladies and gentlemen:
Could it be a parasitic infection?
Could have my body uderwent an invasion, which somehow broke havoc on my body?
The most dramatic changes happened in the first 2-3 weeks, could have my immune system sorta handled the invaders, but not gotten rid of them, so now they are active at a lower degree?

My blood tests otherwise are all fine.

Let me know what your take is on the subject,

Any imput is much much appreciated¤

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