monster

Yesterday I woke up feeling completely ill and spent the whole day in bed.
I just had an overall feeling of 'not well.'
Today I woke up feeling a little bit better, but now I have a sore throat and more importantly tickly sinuses making my eyes feel hot and run. I also noticed my heart rate is faster than usual (especially considering I've been in bed all day) and when I try to stand up and walk, I feel dizzy, like my feet are just off from where I try to place them.
I thought it was just a cold yesterday and that I would probably be fine by today and it is the season for colds and flu. But I did some Googling on nasal congestion and it said it can be a symptom of heart faliure, which really scared me.
I tried doing one of these sinus flushing things where you pour water through one nostril and out the other, but it didn't work at all. It just felt like when you get water up your nose in a swimming pool, even though I followed all the instructions; open your mouth, breathe through your mouth etc, etc.
Does anybody know what's wrong and of a remedy? I really need to get back to school tomorrow for exams. Thanks.