Diagnosed

I am 19 years old and for about 5 days(last week or so), I was fatigued. It got to a point where I was actually the one that decided to goto the doctor. They tested me and said I have a viral infection and it'll just work its course. A couple of days later they call my house and told my mother that they found something bad in my blood work. Today(12.27) was the follow up appointment, and my doctor told me that i've been diagnosed with mononucleosis. She told me that its also known as "the kissing disease". I called my girlfriend today and told her about what happened. She told me that she never had mono before. Now, im confused. I work at a grocery store and im guessing that I got it there. Another thing is that i've kissed my girlfriend before i've been diagnosed. I've kissed her after they drew blood when I was feeling fatigued and she is not...Well currently not feeling no symptoms of mononucleosis.

This whole thing came down as a major drag. Not that I am diagnosed with mono, but that I really, really wanted to become a prizefighter, it was my dream to become one and now I can't because the spleen can become enlarged and can become ruptured. When I came home from the doctor's office, I immediately looked for information on the internet about mononucleosis. The small bump on the back of my neck, the rash behind both of my knees and that I was feeling fatigued for that short period of time are all symptons of mononucleosis.

I am still confused about this whole thing, so I have a few questions.


Is mono something that you will always have?
Or is it something that you get diagnosed with and you get the symptons and it completely goes away?
Kisses are ok as long as no saliva is transferred(just kisses on the lips)?
Can mono be passed through during sex?
Another thing is that my girlfriend has an adorable niece that is about 18 months old, should I stay away from her until I no longer have mono?



God bless.