These are waswas and you must try your best to fight them. Just make sure you perform your wudhu correctly, clean your private part with water after going to the bathroom, and do not think about if any urine was left or not.

I am a university student and for the past 10 months waswas of shaytan has effected me. It started with just small doubt and me acting on it to the extent that my mind is full of doubts when I try to ignore it. This happens especially during purification and prayer. Specifically when I urinate, I always have doubts that some drops came out then for each salah I wash myself and my underwear then go do wudho and then pray and then again I smell my garments to check if urine came out or not. Sometimes I find smell and most of the time I don’t so this increases the waswas. When I pray I always think about if urine came out or no which causes my stomach to bloat and it makes me feel like urine came out but as soon as prayer is over my stomach is back to normal. Every single day I wake up with determination to ignore it. I succeed for 3 or so days then as soon as I act upon on doubt again I go back to that state. I have been ignoring it for so long and I didnt discuss with anyone but my prayers are being effected. I miss standing for prayer for long time and the kushoo. A shiekh told me to ignore it completely and even if urine make out in reality then it will not be taken against me as I am effected by waswas. Can you please tell me any methods that will not be taken against me or should I keep on checking my garments after salah?