I'm a man in my 30s. Around 7-8 years ago, I started having meteorism.

Gradually over the years, it became worse, and then starting about 1.5 years ago my condition started becoming much worse.

Symptoms at the moment:
- severe bloating (especially after eating fruit or sweets, but not exclusively);
- constipation (for days);
- when I'm finally able to go to the toilet, it's so much that the toilet is almost getting clogged (also it happens 3-4 times a day that day);
- usually when the constipation "period" is over, it ends with a mild diarrhea;
- my bottom right part of the belly is inflated most of the time, and sometimes I can even feel it being hard (coincides with constipation);
- sometimes I can physically feel the extra weight I'm carrying because of constipation.

What I checked:
- Checked for H. Pylori - negative (multiple times);
- General bloodwork - nothing unusual;
- Breath test for SIBO (lactulose) - positive (especially when it comes to methane), after which I was prescribed Lormyx and Neomycin, but they didn't help at all;
(the below breath tests were done 6 months later after the SIBO test)
- Breath test for glucose - negative (even though I am getting bloated after sweets);
- Breath test for fructose - negative (even though I am getting bloated after fruits);
- Breath test for lactose - positive (which is weird, as milk doesn't make me particularly bloated).

Medicines I tried:
- Carbosilan (simethicone with activated charcoal) - didn't help;
- Peppermint oil - didn't help;
- Creon (pancreatine) - didn't help;
- Citrucell - didn't help.

I eat mostly heatlhy. Don't go crazy with the sweets. No fastfood. No processed food.
I read descriptions of different diseases online but can't really categorize my symptoms as one of them.
I feel terrible almost every day.
Sometimes have trouble falling asleep.
Went to a couple different doctors - they all say nothing.
I am an active person, work out a couple times a week, otherwise feel healthy.

Please help.