Hello and welcome to Healthcare Magic. Thanks for your query.
Since your blood investigations and cardiac evaluation have come normal, it doesn't appear that your symptoms are indicative of a serious medical problem. Now, Marijuana (Cannabis) is well known to trigger or worsen anxiety
problems. Many of your symptoms are commonly seen in anxiety disorders, and so it is possible that your problem is predominantly anxiety-related.
So, I think you don't have to worry too much about your symptoms. Do follow up with your doctor for further investigations as advised. In case, all investigations are normal, and your symptoms are still persistent, then you may need to seek professional help to deal with your symptoms.
Wish you all the best.
Dr. Jonas Sundarakumar