Gastroenteritis and Pseudo Relapse

Hi, I have RRMS- diagnosed October 2023 on Tysabri. I’ve had gastroenteritis but really struggling with the recovery of it and worried I’m not going to feel like I did prior. On anti sickness tablets from today due to nausea feeling. I’m exhausted with it and finding the recovery harder that having the infection if that makes any sense. How long can a pseudo relapse last please ? I just really don’t feel good and feel my MS symptoms are right up there at present. Any help and advice would really mean a lot. Take care everyone.