I am Doctor Thomas, a double board certified US doctor in internal medicine and integrative medicine, with advanced training in several other fields. I am a clinician of over 20 years experience. I will give you an initial answer or ask you a question, but be sure to use reply to expert to communicate with me as needed.
Your symptoms are typical of Giardia.
This is a ubiquitous parasite world wide, and if it becomes chronic after the acute state, gas is a main symptom.
You don't need a GI doctor which would take time, and you need a referral in the US in most cases.
Any regular doctor can order 3 stool samples, collected at different times.
that should be your next step.
Do not use lomotil, this could cause problems.
We also don't know what medicine you are already on...I will be glad to evaluate that as well.
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Find me as needed.