As per your complain it seems that in case if you had a sexual exposure with HIV positive female but since 4 years your HIV screening tests are negative, you need not to worry as the symptoms of Constipation does not seems to be due to HIV rather it can be due to causes like stress,dehydration, excess intake of antacids,
irritable bowel syndrome, excess intake of dairy,eating disorders, lack of appropriate physical activity, side effects of medicines,
Hypothyroidism etc..
I would suggest you to
consult a Gastroenterologist and get evaluated and he can advise you get investigations done like Colonoscopy, Barium swallow, hormonal assy etc to confirm the cause..
Treatment of the cause can relieve the symptoms..
As of now start taking ample of green leafy vegetables, fruits and salads in diet..
Do moderate workout and take walk after meals..
You can also be advised to take laxativs like
Polyethylene glycol [Miralax], castor oil also acts as a lubricant and laxative..
You can also be advised to take Psyllium husk or Lactulose..
You can also be advised medications like
Lubiprostone or Linaclotide..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.