I’m a 44 year old woman with very swollen stomach has been like this for 4 months?

I’m a 44 year old woman with very swollen stomach has been like this for 4 months
I’ve had Endoscopy / colonoscopy / X-ray and ct scan and every blood test known to man the only thing that has shown up is a small cyst on my ovary but been told it’s too small to be causing the swelling I get pelvic pain and dizziness with a few fainting spells
My gp has told me they can’t find anything wrong and thinks my stomach muscles have stretched I went from a size 10 to now wearing maternity clothes