Anxiety coping tips in relationships?

I’m gonna preface this by stating the fact that my husband isn’t really the issue here lol.

I LOVE MY HUSBAND SO MUCH, and he’s amazing.

That said, when I was a child an accident happened to me that left me with neurological brain damage. It manifested itself in a few different ways but it primarily affected my immune system, my sensory processing system, and my emotional processing (not sure what you’d call it). I’m totally functional like a “normal” person, but I struggle with things such as getting sick easily, chronic pain, I don’t handle sensory things very well such as noise, bright lights, etc. i also emotionally struggle with feeling worthless and am constantly consumed by anxiety. There is no medication I can take for any of this, believe me we’ve tried all that since I was a child. I’m also deathly allergic to anything that isn’t “natural”- which is also a product of how my brain injury affected my body- so I can’t have any type of drug/medication 😒

Here’s my issue! Whenever my husband and I get into a fight of sorts, I get filled with panic level anxiety over him suddenly not wanting me anymore and leaving me. We also have two small children. We don’t fight often, we actually have a pretty peaceful marriage. But nobody is perfect lol. he was stressed out, took it out on me, I stood up for myself and we just got into it. It was absolutely stupid. Anyways I apologized and he’s still pretty mad at me, and I just struggle to contain my anxiety over this type of stuff. I’m trying to give him space but I feel like I need the reassurance that our relationship is okay- even tho I know it is. It’s so annoying and he already told me a few times that he loves me and he just needs a bit to cool off. But ugh. Haha. I am always paranoid he will leave me through no fault of his own, and I don’t know how to stop myself from being so anxious! I don’t want to smother him and be clingy either. Does anyone have tips for me?!