Hey sikan, have a really great trip. Hope you get this before you leave. For the sore throat, try ZBEC (found near the stresstabs in the vitamin section) Or any other similar product. It has Zinc, Vit B, Vit E, and Vit C. I take it whenever I feel a cold coming on or if someone in the house gets sick, and I either don't get anything, or else it is greatly minimized.
And to answer your earlier question, yes, we all feel that way when things begin to work out. You are holding in your emotions for so long and doing the "as-if" and "180" thing. You try so hard to be "fun" and "happy" and it really takes it's toll on you. When things come back around for the good, suddenly it feels as if it is all coming down on you.
In my case, I wondered if I would ever be able to trust H again (yes, I do now) or if I would love him (I do, very much). I wondered if I would ever get over the pain of the EA (I did) and just basically felt very angry, hurt, and emotional for a long time. I felt it was very hard once he came back not to just "make him pay" when I began to feel these feelings. Instead, I talked with him matter of factly about what I was feeling and he was very receptive. He recognized how hurt I was and he was amazing at making me feel like it would work out.
For the sore throat, try ZBEC (found near the stresstabs in the vitamin section) Or any other similar product. It has Zinc, Vit B, Vit E, and Vit C. I take it whenever I feel a cold coming on or if someone in the house gets sick, and I either don't get anything, or else it is greatly minimized. 
