Can new symptoms appear without relapse?

Recently my intolerance to histamine has increased and I now get a histamine response to lots of foods. In the last week my hay fever ran away with itself and I had the worst dry eye I've ever had. At the same time, a couple of existing MS symptoms got worse, fatigue was immense all my muscles were shaking when I moved at all, and I am always a little numb on my right hand side and suddenly my whole right hand side, head to toe, became numb for a split second, and another time my face on the right became numb for a split second. I thought, you know, it can just be like usual, existing background symptoms get worse sometimes. Then when I was writing my hand (right) started jerking in towards me at sudden random intervals so I'd be writing a sentence and suddenly my n had one leg reaching down to the line below or something. Then my hands, both hands, started being fumbly when I was trying to do things, like puppets hands, not responding to what I told them to do, especially with small objects like putting a key on the lock, tying my laces, or picking up a small thing and placing it in a specific spot. And my face may not be completely numb but I feel like I'm speaking with a fat tongue. It is all improving now, thankfully! Of course I left it until it was getting better before I spoke to the MS nurse, and of course she's asked me in for a test tomorrow to see if it's a UTI, and it'll have improved by the time she sees me so it's fine. But it was very difficult to separate all the things happening at once. What do you all think? Were all or any of them related or coincidence? Was the new hand symptoms a relapse? Can new symptoms like that appear spontaneously without it being a relapse?