I am sorry to hear!!! That is very frightening! With the surguries and the infections you could be heading towards a relapse... Stress and infection has shown to lead to exacerbations.
There are plenty of other meds out there for MS. It is terrible that your doctor feels that you should stick with just one regaurdless of the side effects! A second opinion may help...
Hang in there and know that you aren't alone! Many have gone before us and I am interested in what they have to say as well. I have been fighting a relapse for almost a month now, with things "jumping" out of my hands and my legs feeling sooooo heavy and tight... and the FATIGUE!!!! I am lucky to be awake right now... I just hope tommorrow will be better..