What Do Headaches Along With Swelling In The Lower Gums Indicate?

I have been researching what could be wrong with me. I was out of the country for 3 weeks and when I got back I started with a cold. I let it run 2 weeks, the after the 3rd week it wasn t better so I went to Urgent Care to see a doctor last weekend. I had been having really bad headaches, I thought I might have a Sinus infection even though I didn t have really any drainage. We decided to wait till Monday for a CT Scan and that showed not a sinus infection but inflammation in my sinuses. So she put me on a Steroid. I feel like my whole brain is swollen and now it is affecting my gums. it started by 1 tooth the other day and now my whole lower gums are swollen. I do get tingling in my feet and have a little problem with balance but don t seem to have much of a fever. My face was flushed like a butterfly but I don t know if that is from medication or not. I was thinking I could have encephalitis, meningitis, or even MS? I ve left message for the doctor to call me back but haven t hear from her yet,