Can parasites cause internal bleeding and bruising?

First time on this forum so apologize if I picked up wrong section for this topic.

I'm struggling with abdominal pain since about 11 months. At the beginning the source of the pain could be easily localized in single point in the lower right part of my abdomen although during the time it started spreading more widely even sometimes to right lower back.

I'm connecting the rise the issue with running (sport, huge exhaustion) although during that time I was eating a lot of different food coming from unknown source. More over, last year I moved to the apartment where there was a lot of tiny small insect which I recognized as booklice (which also can potentially transfer some infection when accidentally swallowed).

After the December/January accident I was wearing for a long period of time hernia support belt and I noticed that the warmer I keep my abdomen the more relief of pain that brings. Also that lower right part of my abdomen is also usually warmer than the rest of the body (such as indicating some internal inflammation).

At the beginning I could eat almost any type of junk food I want and nothing happened to me. During the time (that 11 months) I started becoming more and more sensitive to a kind of food I'm eating. For example: before I was usually easting 2-3 bananas during the day but now I can barely taste a banana fruit (once eaten it's kind of disgusting for me).

During the time the pain (or more precisely described now 'the dead zone' of my abdomen) developed and I'm feeling worse and worse. Sometimes I feel like my belly is extremely stretched from inside out.

I made quite a lot of examination during the past 11 months:
- from January to June ALT and AST were higher (accordingly about 92 and 47), this went to normal since July (could be related to a bad diet)
- Abdomen Ultrasonography 3 times (about March, July, October) - nothing discovered
- Anti-HBV, Anti-HCV examination - ok
- 4x stool sample examination against parasites - ok
- Stool sample examination against Giardia Lamblia antigen - ok
- Toxoplasmosis, IgE blood examination - ok
- One blood test showed raised level Amylase (test made during the period when I was wearing hernia support belt)
- Rectoscopy - ok
- Small bowel X-Ray with barium - ok
- Colon X-Ray with barium - ok
- Abdominal MRI without contrast - ok

Applied medicines till now:
- Pyrantelum
- Albendazole 400mg (one doze for three next days)
- Niclosamide 500mg (single doze) + magnesium sulfate

The pain is constant, there is no periods when pain is gone and then come back, it stays all the time, sometimes with a little bit more power and sometimes little bit less.

After eating a raw garlic the pain source was activated for a short time (I felt that something is being done there).

Since the very beginning I noticed that after a robust protein meal my stool contained a lot of small rice-like white grains (that's why I also started relating my sickness to some parasite infection). This grains are static - they are not moving.

Two weeks ago I ate a huge meal at restaurant (usually I'm not eating such a lot of food at once) and after one hour I got a little fever and had to even take a painkiller. Even resting not help much then although within 2 hours the issue gone by itself.

One week ago I decided to return to my running activities (I held it 2 months ago). After three quarters of a distance I started feeling a little bit more pain than usually. Although, I decided to continue running to the end of a distance. During the next day I noticed that I've got quite decent bruise directly in the area of source of my pain. Together with that bruise I also "produced" (first time ever) stool with blood within it. It hasn't repeat since then (that was the only one time when I had blood in my stool. According to this is had to be directly related to the internal bleeding because of running. I run with hernia support belt.

My surgeon suggest that I should do a capsule endoscopy of small bowel and then, if that won't show anything, make a laparoscopic camera diagnosis against some bowel obstruction.

I'm also planning to take pills against Giardia Lambia just in case, even if the test against them hasn't detect these parasites in my body.

Can parasites cause some much troubles and pain? Can they be responsible for that internal bleeding and abdominal bruise?

Any suggestions highly desirable.

Below pictures of a bruise and sample stool: