My symptoms are: Swollen glands in neck, muscle and joint pain and all over itchiness... I am wondering what possible diagnosis I might have...

Anything from an allergic reaction, to something medium-serious like mono or mumps or dental problems, or something very serious which I won't bother listing.

We can't possibly know online, even if you described yourself and history all day.

You could
Take your temp
Try an OTC anti-histamine for a few days
Look at your gums and teeth with a flashlight and mirror
Feel all over for any more lymph nodes around areas where you ache
All while waiting for a doctor appointment.