I sympathise with you as your traits are very exact to me as I also suffer from OCD.Please dont despair as this condition has virtually left me mentally disabled at my worst encounters but after living with it for nearly two decades(since being diagnosed ) I am still here to tell my weird synic and sometimes humourus rituals......like yourself I have this fixation with numbers ,intrusive thoughts and checking (multiple times) in amongst many paranoid rituals..... which they diabolically reign over me.......But I will share somethin weird just for the record...I always sign in fountain pen and blend my own tints of inks I fill my pen with...thinkin someone would forge my signature ,as I am a person with many moods that also comes with depression has diffrent days and hence my signature is never the same(lol) I would have to sometimes sign duplicates that are double backed up and because fountain pens are press sensitive the imprint wouldnt bleed thru duplicates and certain establishments like doctors surgery would be purplexed as they saw me sign it but it never bleed through this would sometimes create a bit of humour and confusion,Any how having said that I feel you crisis and wish you all the best and consult with your practitioner with any growing concerns.All the best and take care!!!!