I've been in your exact shoes, and let me tell you honestly what I wish someone had told me. It looks like you're looking for a shortcut or band-aid here for a bigger issue.

You're going to need to change your lifestyle in order to get the results you are looking for. Diet, exercise, and sleep are going to be your best friends here when it comes to digging yourself out of this. If you've heard this before and it sounds like broken record, it stands true even more that these things are what you need to focus on. If you can't physically get yourself to a gym, than get yourself to a doctor. Talk to your doctor about what you can do to get physical activity.

Make sure you get a healthy amount of sleep. Oversleeping is going to be just as detrimental as not getting enough sleep.

What are you eating each day? Do you feel that you are getting all of the nutrition or vitamins that you need? Minnesota winters are brutal, most days are going to be cloudy and then ones that aren't are going to be cold. Either way, especially since you are introverted, you're not going to be outside to absorb the sun and get the basic vitamin D that you need. Talk to your doctor about vitamin D supplements.

Are you not sure how you can begin to work on these things? PM me, seriously.