I hate to tell you, but none of us have time to be sick. :) Unfortunately we don't get to choose these things.
First of all, you should probably not pursue this issue until you have insurance lined up, because the testing and treatment for MS costs tens of thousands of dollars each year.
Once you have health insurance taken care of, you need to get yourself into a doctor and get started. You may have MS, or something else, but chances are that it will take several months if not a couple of years for doctors to decide what's wrong with you. Once you have a diagnosis, there are many treatment options available. For MS there are treatments available that can help slow the progression of the disease, so this is an important reason to get things going as soon as possible. Also for MS, if you are having a severe relapse, or exacerbation of symptoms, your doctor may order a short course of steroids to help your body snap out of it. There are also treatments available to help alleviate many of the symptoms of MS, such as medicine to help with fatigue.
For now, you should try to avoid temperature extremes, especially becoming overheated, because that could exacerbate your symptoms. You should also try to find ways to get more rest and concentrate on prioritizing your activities. Nobody wants to be sick, or to slow down their life, but fatigue and stress can both make your symptoms worse, whether you have MS or some other problem.
Last thing, that tightness around your rib cage sounds like a typical MS symptom, the "MS hug." Good luck, I hope you can get things worked out.
Be joyful in hope, patient in affliction, faithful in prayer (Romans 12:12).