Hi,Good Evening.This is Dr.Savaskar from India,attending your query to my online HCM Clinic.
-I studied your query in depth and Understood your health concerns.
-Accordingly on the facts given by you-
Treatment I would suggest is as follows-
a-Your general health is run down due to the multiple systemic symptoms and hence I would Suggest you to consult a Surgeon and Physician whose team work would be needed for proper treat planning and early recovery.
.b-For the small lump on right of neck-which appear to be-Chronic infected lymphadenitis-I would advise you to have FNAC-
Biopsy to fix its cause.If its TB-anti-tb treatment would take care of it-as you are 19 only.
c-For the 
IBS with gerd?-symptoms-stool examn and OGD would fix its cause and would be treated accordingly by the SurgeonThe morning stomach pains suggest gastric Ulcers-post-meal and needs 
Proton pump inhibitors to control it along with treatment for infective causal factors for the gastric ulcers.
d-YOu have multiple symptoms,by which you get tired very fast
e-Beside this to avoid any further missery-follow  normal bland diet with banana shakes 2 times a day, with home food practices/ avoid outside food and get full treatment with your doctors for next 2-3 mths at-least, here on-wards,as yours is a complex health issue and you need to be serious about it on the lines suggested herewith.
Wishing you healthy living and early recovery of this query.
Wellcome for more queries till you get the satisfied.Thanks for your query to HCM Clinic.Have a Good Day...!!
Dr.SAVASKAR M.N.
M.S.GENL-CVTS,
Super specialist and Senior Consultant-and Expert in Non-Curable-Disease therapy for Cancer,Asthama,etc,
Rejuvenation therapy and Tissue failure -reversal therapies.