Join a reputable (ie. full service) health club and get your butt in a regular workout program. It's called payback for your life.Some guys play golf, your gonna pump some iron regularly. I'm talking 4-5 times a week for a couple hours each time. I know this works, I started when I was about 60 yrs old and now feel like I'm 40 after doing it for 6 years.
The first thing is to determine if all of the injuries from your accident have been adequately repaired. This sounds questionable, since you're still taking pain med for them. "Pushing through" that kind of pain isn't the way to go... if you have to do it that way, perhaps you need some sort of physical therapy or something to retrain yourself before you embark on a real fitness endeavor.
That said, we can't ever go back to the person we used to be; we simply move on to the next stage of our lives. Apparently, no one has ever told you that skinny isn't sexy. At the age of 35, you'd be much better off to leave skinny for the kids and work yourself in a fit, mature kind of sexy.
There are a lot of different activities you can engage in that will help get you fit... Very few of us have time to go to a gym/health club 4-5 days/week and pump iron for 2 hrs at a time, since most of us have jobs and other obligations, so you simply have to choose something (or several things) that you enjoy and get started. You don't have to do the same thing all the time, either. You can try swimming, skiing, hiking, plain walking (best exercise there is) or any number of other activities you enjoy. Dancing, yoga, anything that keeps you moving on a regular basis are all fine.
Be sure to get, both, cardio and strength training. Cardio burns fat, strength training builds muscle, which burns fat even faster.
Calculate your daily calorie needs and implement a food diary to keep track of your intake so you make sure you aren't eating too many calories.
Make the majority of you diet veggies, adding in plenty of lean protein, but don't overdo it. Make sure you get enough healthy fats from things like avocados, olive oil, nuts, seeds, etc. Opt for whole grains instead of processed foods. Eat fruit in moderation, because even though it's "natural" it has a lot of sugar and spikes blood glucose levels, which in turn spikes insulin levels. Insulin is a fat storage hormone!!
As far as your medications, it's very possible you could get off, at least some of them. If you exercise and get your back in shape again, you may eliminate the pain, which would allow you to get off the pain med (or at least cut down on it). Yoga would be perfect for that. Losing weight and getting into shape would greatly help your blood pressure, which could help you get off the lisinopril. Proper diet and weight loss could improve digestion enough to allow you get off the prevacid.
You might also consider having your thyroid tested to make sure it's functioning adequately. Digestion issues, weight gain or inability to lose weight, body aches/pains and blood pressure issues can all be symptoms of hypothyroidism (under active thyroid). Ask your doctor to test TSH, Free T3 and Free T4.