Long post ahead, probably heavy themes too. Please be kind!

I am in a serious, committed relationship where we both love each other a lot. I have been suffering with diagnosed severe anxiety for years and recently some other mental health issues as well. One thing that bothers me is that I always get excessively worried when my partner does not reply for a while, since we always text each other with updates throughout the day. It’s not normal for us to go 3-4 hours without texting each other (I know some people would think this is unhealthy, but we were long distance for a while so being updated is really important to us). 

Therefore, if my partner has not replied in a few hours (which I think happens maybe once every two weeks), I would worry a lot and think something bad has happened to him, such as car accidents or he unexpectedly got sick. I would then try ringing his phone multiple times, and if he does not pick up then I go into panic mode. During these times I experience intense physical tension (sweating, heart beating fast, crying) and even do ridiculous things like checking local news or traffic updates to see if new accidents are reported. I cannot admit that I do those things because I think I am literally crazy for that. It’s not about not trusting them, nothing like that. It’s a mix of really loving/being attached to my partner and also my anxiety making me think the worst every time. My partner has never gotten mad at me about this influx of phone calls each time but he might find it slightly weird. There are other things I worry about regarding him too so I come off as nagging a little (always asking him to stay safe etc)

I realized that maybe other people would feel freaked out and burdened if someone excessively worries about them like that. So, I feel bad about the way I am but I cannot find a way to reduce this anxiety. How would you feel if you’re my partner in this situation?