hello there!
thank you for asking. i read your query and i want you to know that the condition you are facing is called intestinal
motility disorder and it needs a lot of care and a good gastro enterologist to help you treat this.you seriously need a manual evacuation as 3 weeks is way too much for bowel stagnation.
Here are some life style modifications you need
Increase fiber in Diet
Increase fluids intake
Avoid fermentable foods
Take supplements for vitamins, and minerals (eg, vitamin B-12, iron, calcium,
folic acid, water-soluble vitamins, vitamin A, vitamin D, vitamin E, vitamin K, trace elements)
Consult a dietitian for better guidance in meals selection
Avoid strenuous physical excercise, Milds are not forbidden
avoid too much use of laxatives, diuretics, benzodiazepines, and
anticholinergic drugs should be limited. Such agents may interfere with gastrointestinal motility and adds to the trouble
Following is the list of some medication you might need
1-Cholinergic Agonists
Neostigmine (Prostigmin)
Bethanechol (Urecholine)
2-Prokinetic Agents
Tegaserod (Zelnorm)
Metoclopramide (Reglan, Metozolv)
Cisapride (Propulsid)
3-Opioid Reversal Agents
Methylnaltrexone (Relistor)
4-Antibiotics
Erythromycin (E.E.S., Erythrocin, Ery-Tab)
You need broad spectrum antibiotics to prevent and treat stagnant loop syndrome with bacterial colonization
I wish i was of some help. take some good care of yourself
Regards
Dr S Khan