I was diagnosed with neuritis as well.
I had this for many months. I think its worse when you sit leaning forward which is probably common when using the toilet. Try not to lean forward and see if it helps some. When I was doing my vestibular rehab I started doing some of the exercises in a sitting position while leaning forward and I think they have helped some.
I have the boat feeling as well. Like you almost exclusively when sitting still now. Hopefully it won’t get worse for you because it can. I had it for many months while standing and walking around too, but almost never in those positions now… I have problems with a sensation of my right foot dropping while walking that I’ve never been able to get rid of.
One of the things that has really helped me after walking for a while and sitting down and having the boat rocking sensation start. I do an eye exercise that helps me significantly. I will try to explain it:
I keep my head still and pick an object on the left wall about eye level and an object on the right wall about eye level and I move my eyes between the two objects for about 20 to 25 repetitions. Then I do similar vertically on the top and bottom of a wall… Not sure how it helps me but it seems to…
The other thing that has helped me a lot was taking dairy out of my diet. I’m not sure if its some sort of migraine trigger or if I have an allergy to one of the dairy proteins (whey or cassien). After taking dairy out of my diet for 2 weeks and reintroducing milk or yogurt I would notice the vertigo got noticeably worse after eating so I’ve had to remove it from my diet. It’s not easy to replace the protein from dairy but I’ve had significant improvement with this dietary change and a simple eye exercise after sitting down. My walking still isn’t normal but I’ve gotten a lot better and I’m not taking any medicine.