Im always worried that im ill or going to die ....?

i always panic that im ill like now i am panicking about me getting brain cancer and i swear i have all the symptoms , i might just be making them up in my head it probably is just that but it is really annoying . i spend all that looking it up on the internet and i send millions of questions about it a day , i take days of school because im so worried about it . i worry about a lot of things and it is roughing my life . there hasnt been a time in about a year that i havent been worrying about something. what can i do ,i do go to a counseling because of my mums drinking problem and because i was worrying so much . my mum did stop drinking while i was at consoling but like a week after she started again so im embarrassed to go again .