Need help very badly, please!

Let me start by saying that neither I, nor my husband have epilepsy. neither of us had ever had a seizure before 2days ago, so I apologize if I am posting in the wrong place, but I need help. 2 days ago, my husband had a bad reaction to the prescription drug, tramadol. he had a tonic-clonic seizure right next to me in our bed while we were watching tv. it was absolutely the most terrifying thing I've ever seen in my entire life. I can't still hear the noises he made. the images of his body seizing and his eyes rolling in the back of his head will not leave my mind. Within 20 minutes after having the seizure, he was 100% back to normal, besides being a little stunned by what I explained to him had happened. and since then, he's been totally fine, back to normal. no headaches. no cloudy, fatigued feeling. no muscle aches. nothing! but I have been a hot mess to say the least. I'm driving him crazy because I've been following him around like a puppy dog, afraid to ever leave him alone because I'm scared that he'll have another one when he's standing and I want to catch him if he does. I even made him let me stay in the bathroom while he took a shower last night. he doesn't understand what I witnessed, because he doesn't remember it. I'm constantly crying. I can't eat. I can't sleep. I constantly feel like I'm on the verge of a panic attack. I feel incredibly paranoid, not just about his seizure but about everything. I just have General, intense feeling of impending doom. I don't know how to get over this. he's no longer taking the tramadol, so intellectually I know that he's not gonna have another one, but that isn't stopping me from feeling this way. Will I ever be ok? will I ever recover? will I ever be normal and carefree again? I don't know how long I can live like this, in constant fear and panic. I just feel so lost. does anybody have any advice as to how I can pull myself out of this? or at least any encouragement that is will subside eventually?? I'm desperate...