I was wondering if I could have any feedback

or advice. I'm a 25 year old woman and I've found myself constantly worried sick that I might have cancer. I have smoked for a long time but I have had a persistent cough on and off for about the last 2 years, I always brushed it off and assumed it was just a 'smokers cough' but now I have found 2 lumps in my neck that have been there for several months, they are hard and don't move under the skin, about the size of a 5p coin. I tend to get a sore throat often and I have had tonsillitis before but my right tonsil looks slightly more red and swelled than the left, which has also looked like this for several months. I have a doctors appointment tomorrow and I am going to push as much as I can to get further testing but I know from experience that they brush you off all the time. I've been panicking beyond belief for the last few weeks, I have severe anxiety and depression at the thought of having cancer to the point I'm losing sleep and crying. I have missed 2 doctors appointments previously due to bouts of the flu, both me and my daughter, also she's  been in and out of hospital due to general illnesses and high temperature. Please can someone get back to me and let me know if they have had similar experiences? And what it turned out to be?