Hi welcome to Health care magic forum.
Thanks for choosing H.C.M.F.
As you describe You have pain in the lower abdomen, back ache, and spreads upto the neck when you stand up, and feel like fainting
. You are also getting sulfuric burps.
The smelly burps suggest some thing wrong with the interstines. May be amoebic colitis, Ulcerative colitis
Other possibilities are urinary tract infection
, or stones in the urinary tract
, which can show effect on the pull of the body. The drugs used for it may cause constipation
I advise you to consult an urologist
for diagnosis and treatment. You may have to go for M.R.I.besides other routine tests for confermation.
Wishing for a quick and complete recovery.