Hi everyone
Im new here so please go easy

My names kelsey and im 24 with 2 little girls.
Long story short - i suffer from anxiety PTSD BPD and depression the worst of which ive been finally dealing with for the past 5 years tho ive been a fully suffering for about 13 years. The last 4ish years ive been on my meds and ive been with my partner for 5 years.
Were due to be married June 2017, weve not had the easiest relationship but weve made it through. Tho recently a female friend of mine has came back into my life shes a child hood friend and i love having her back in my life so much that shes my bridesmaid. But over the past week or so my anxiety has been extreme, i was convinced my partner had feelings for her and was no longer intreasted in me...i was convinced of all the things that could happen or go wrong that they were going to happen and i began to keep questioning my partner. Today i felt so low with these thoughts that i was about to end everything. Now we have both sorted things out and its better and still deeply in love and due to be married but i am still petrified of these thoughts and how much more there going to show... i dont want to loose my family but these thoughts are the most powerful ive had in years they cloud everything and drain me so low. Im so scared my relationship will end because of them! Has anyone got any help at all?
Thanks