Serious suggestions:
Your doctor is prescribing you weight loss medication. Surely he can refer you to a nutritionist? Tell them your goals and work with them. It would probably go a long way to help you learn about nutrition and form new beneficial habits.
If you want to gain strength, start lifting weight. Find a program you think you might like and give it a try for a few months.
Save your drugs for now.
@malfeasance laid out your first few steps to success. Implement those steps, and in the meantime, do some learning about diet, training, and then steroids. There is a lot of information on meso. In addition to the meso search function, I sometimes find it easier to search the site using google or duckduckgo by typing site:thinksteroids.com and then adding keywords.
You've gotten great advice here from some very knowledgable members. I encourage you to take their advice seriously.
Remember, its a marathon, not a sprint.
Also, sustanon is not conducive to a 3-4 week run.