Terrified I have pancreatic cancer

It started with this back pain I’ve had for 4 months it started out of nowhere in my left mid to upper back region. The pain comes and goes and isn’t excruciating. I just ignored it until recently at the beginning of December I drank a whole bottle of wine and the pain was horrible I had pale stools and my boyfriend said I looked yellow I didn’t think I did but he did. I drank water and relaxed and the pain went away after I went to sleep. It was still there but not excruciating. I worried about it for my whole trip when I went hope to visit family. The pain in my back comes and go randomly hurting when I am doing nothing. Some input I was drinking alot and smoking vapes for 4-5 years off and on. I am a 21 year old female. I got sick one day and had a fever started coughing up blood and went to the hospital. I was worried of lung cancer but was given blood work and X-rays everything was fine. So I knew it was just my bronchitis acting up from last month. I was relieved and went on feeling good I thought I was ok. Then I spend the day after the hospital feeling fine and cooking cleaning. I make veggies with quinoa ate it and went to sleep. Woke up in the am with horrible stomach pain, I spent the day with stomach pain and burping excessively. Now I was terrified as I thought about PC symptoms. The pain eventually went away in my stomach but I kept burping and now I have loss of appetite, lost 10 pounds in 2 weeks from barley eating and prob stress but I’m also worried it’s from something more serious. I have just been looking up PC symptoms and stories trying to get answers but nothing is helping. I have mo appetite list of gas in both ends, the back pain still and have been more itchy than usual. I’m wondering if I’m just causing these symptoms myself or if something is really wrong. My doctors said I should worry about that and it should be the last thing on my list of problems. That I am too young and it’s rare. I am still worried my blood work was all normal except for billirubin in my pee which the doctors didn’t say anything about I read my results and googled it. It says it’s not normal and could be a liver problem or a blockage in the biliary duct. That caused more stress and worry. My blood platelets were high as well. Doctors said nothing about my blood work or were worried. I have a gastroenterologist appointment the 17th of January but it’s so far away and I’m so scared. I can’t focus on anything else but worrying I have PC. Any ideas, help or knowledge on what’s going on. Thank you for reading.