My relationship making my anxiety worse

I have pretty bad anxietytowards a lot of things in general. Recently it has been heightened when I am away from my significant other. I often create situations where I tell myself that they are dead. I don't want to seem needy I just really care for them. I also always have this stone at the bottom of my gut that triesto tell me the relationship is going to be over soon. Sometimes I think I should just end the relationship so I can get back to normal, I care about them too much though.