Hmm, My Tricky Cold Symptoms

Hey, my name is Kaitlyn. It's almost spring and I have a cold, sore throat, and a weird ear problem. The ear problem is this: I can't really hear(but I can) out of my right ear and it is very pressure-y feeling. My mom has said it is the eustaion tube being filled with fluid, but I just don't know. I have missed school for two days now and I hope that I can go tomorrow. I used Sudafed (the Generic one) , and I felt a little bit better. Although, I am still sick. Also my boogers are yellow-ish...is that okay? HOW do I get rid of that ear problem, if I can?