The hard part is admitting it's a problem. Once you do, your chances of fairly rapid recovery are very good. Yes, many physical problems are often related to stress. Headaches, insomnia, TMJ, irritable bowel syndrome, skin rashes, high blood pressure, heart problems to name a few are often caused by anxiety. And they also often respond very well to interventions aimed at reducing anxiety.
Many people use alcohol and other drugs to control anxiety.
Marijuana is a very common one that people use. It does often calm you down and make you worry less while you are high, but the anxiety just returns when you're not high. The same is true with alcohol and other drugs. However, this can become a vicious cycle. Drugs are a short-term, not very effective way, to deal with anxiety.