What is the ruling on prayer and ablution for one afflicted with obsessive-compulsive disorder (OCD) in acts of worship, and who frequently experiences flatulence and gas, and what should he do when the condition is escalating and affecting his physical and psychological health?

The cure for obsessions (waswas) is to disregard them and pay no attention to them. If you enter the toilet, relieve yourself and exit quickly. Do not pay attention to the devil's insinuations about passing wind or anything else, unless you attain absolute certainty. If you are certain that wind is passing excessively, without stopping at any time, then your ruling is that of one afflicted with سلس (incontinence), meaning you perform ablution for each prayer after its time has begun, and then you pray the obligatory (fard) and voluntary (nafl) prayers. You must resist these obsessions and not succumb to them. You may also consult trusted doctors or the counseling section on this website.