Dealing With Waswas in Salah, Wudu, and Purity Doubts

I have lots of circumstantial evidence that I prayed maghrib but I have strong waswas and I’m doubting if I prayed - I did wudu in order to pray maghrib and I remember fixing the prayer mat. I remember I was constantly thinking about my asr prayer throughout due to another strong doubt and during the second rakat to tashahud I was wondering if I should change the prayer to asr but didn’t go through with it but if I was thinking to change the prayer to four rakats that must mean I was praying three rakat maghrib ..? Also I normally have my phone with me and pray but this time I didn’t and asked for my phone which would have happened after I prayed as I was seated on the prayer mat at when I asked for my phone so I must have completed maghrib - the doubt came after I was searching things up to clarify the doubt I had about asr, when I was still seated on the prayer mat - I’ve already prayed isha and Taraweeh but throughout my isha and Taraweeh I had the doubt if I prayed maghrib throughout - do I need to repeat maghrib and isha? If you’re wondering why I just didn’t redo Maghrib it’s because the time for Maghrib was over by this time and also I was trying to not give in to the waswas but it’s so strong that it’s not left my head. I’ve only just stopped feeling anxious. In the future, If I doubt if I’ve prayed a prayer and prayed the next one as well and I feel like I need to pray qada for the previous one - do I need to repeat both the previous one and the recent one to maintain the order of prayers? So in this case I’ve prayed maghrib and then isha but doubt if Maghrib was correct and think I should redo it, do I now have to repeat my isha as well even though my isha was correct? This has happened before but a couple months ago and I think I repeated both. I have waswas and it’s affected all parts of my life now: I actually go to bed anxious and wake up anxious for numerous reasons - I wake up anxious in fear of nocturnal emission, and then that messes up my day, I worry about impurity transfer and feel like some many places in my house is impure and try to avoid touching and stepping on it, I take forever doing wudu and salah because I need to make sure everything is washed or if I’m pronouncing the words, if I’m in the right rakat or sujood, I doubt if food is halal in a non Muslim country like snacks and restaurants and if the creams and cosmetics are halal due to alcohol and preservatives (how do I know which is khamr). As a result I’ve lost sleep and an appetite and I’m starting to procrastinate acts of worship and other aspects of my life. My family has noticed and it’s affected my mental health, I have contacted a counsellor to help me but I feel like it’s not doing much with my ocd. Is there a clear cut plan on how to overcome this - I do say my evening dhikr, and say some on journeys. I do put on the Quran out loud in the room. I try to read Quran however not often due to doubts about purity, I’m now starting to get doubts on the splashes from the toilet and if that makes my clothes impure and I try to check but can’t see anything but I recall feeling a drop or two. I know my first request is a bit silly for asking if I’ve done maghrib. but i have a lot of circumstantial proof that I likely did pray maghrib - based on this can I assume I did? Or do I repeat maghrib and isha tomorrow? As I’m going to try to sleep this doubt off - what to do if it persists even tomorrow? I know im not supposed to give in to doubt but how should I deal with this if it happens again (if I’ve doubt if I prayed) Also one of the reasons why I struggle to stop these thoughts it’s because it usually attacks the fard acts of worship - ghusl, acts of wudu, pillars in prayer which makes me believe that I must get it right or repeat if I’ve not done it or doubt about it because it wouldn’t be accepted otherwise or I missed out on an obligatory act - as someone with waswas is there leniency on this? As in even if we did miss it can we ignore it if we’re genuinely not sure and does this make us sinful?