Hello, I am a 25 year old male, 5'11" and 155 lbs.
Diet is almost vegetarian (no beef, no red meat, no pork. Chicken and turkey are eaten and no soda) I drink coffee daily, use nicotine (primarily electonic cigarette), and take amphetamine during the week for work. I'm usually pretty physically active, though for the last six months I've been largely sedentary to gain weight.

I am bisexual, from 2010 to to 2014 I was in a committed relationship with a female. Then we broke up. During our relationship we had abundant sex and there were times where a pregnancy scare would have been appropriate, but never happened (which I'm grateful for). But one month after we broke up, my ex gets pregnant with another man on accident. This leads me to question my fertility and functionality of my reproductive organs.

Since having broken up I've had a multitude of male sexual partners doing everything like oral (giving/receiving) and anal (giving/receiving). I've had a tear in my rectum that caused minor bleeding and pain during bowel movements. I treated that with medicated wipes and preparation H along with vitamin A and D ointment.

That went away, now I have another problem. I can become arouswd and achieve erection perfectly fine (though I've noticed erection quality has diminished lately likey due to lack of exercise and amphetamine use). There is a good amount of preseminal fluid during stimulation, some of which may even be semen due to cloudy appearance.

But, during orgasm/climax I've had extremely low volume of semen for the last week or two. My climax feels different machanically. I do not get the "squirting sensation" with propulsion of semen, but feels more like the muscles in my prostate aren't working hard/properly enough to propel semen properly through the urethra. What I feel is my ejaculatory system working really hard and struggling to push semen up through the urethra and what is usually a series of six to twelve "squirts" is now one drawn out forced attempt to force semen up through the urethra with limited success.

Now, lately I've been bottoming more often than not (anal sex - receiving). And using toys to stimulate my prostate. My first inclination is to say that there is inflammation, infection, or damage to the prostate that is causing this. Moreover, I briefly examined my ejaculate today and it seemed slightly brown. This could have been my eyes, or the lighting in the room, but it seemed to have a slight brown tint to it.

What are my potential diagnoses? I've got bloodwork within the last month and the only issue was vitamin D deficiency.

I also take:
Multivitamin
High EPA fish oil
Ubiquinol/pyrroquinoloquinone
Agmatine
Ampamet

Please help!! I am scheduling a doctors appointment alongside this.
Thank you so much!