is my relationship gona end

Hi this is my first time ever posting in a forum but I am in need of some advice I used to be a highly positive person but about couple of month ago that changed I suddenly started panicking about everything it started with me with just been paranoid about that people don't like me it got me really down the thing that as got to me most though is I now really worried that my relationship of 3 and half years is going to just fall apart I got it into my head that my partner will resent me and will leave me even though he has shown me nothing but love I have had thoughts of ending it with him but thought of that makes me feel sick with anxiety the thought of losing him is more than I can bare I have recently been diagnosed with anxiety disorder so wondering if it that that coursing me to feel so bad