Medical Marijuana and Work

First off this my first post on any Marijuana forums so sorry if it's not put together very well.

So first off just a background on me, I am currently 21 years old, and live in Illinois. I used to smoke marijuana in high school on and off to get high and I loved the feeling, but stopped once I got in colleg due to drug testing. I'm now done with college and have landed my dream job that I wanted since I went into the program. I passed the drug test no problem since its been so many years since I've smoked but I don't know if my company random drug tests, and due to my security I don't want to name the company. Every since I was young I've rode motocross and street bikes and all kinds of stuff and after crashes and stuff I now develop pretty bad upper back pain right in between my shoulder blades after sitting or staying in one spot to long. I find myself squirming around even just sitting on the toilet for a few minutes trying to stop the pain. Laying down flat on my back tends to help the pain.

Marijuana vs Prescription Pain Killers
I know there is tons of talk about this everywhere on the Internet but this is just my opinion. I've had many friends become addicted to prescription pain killers and I have always hated pills and drugs of that sort. I found when I used to smoke as a child a strain with a good body high was really good at easing the pain away. Illinois now does offer medical marijuana and I have been thinking about seriously going to a doctor and talking with them about a medical card.

The problem...?
So now is where I want some recommendations. I have thought about going to the doctor and seeing if it's even something they would offer me a medical card on ( I know Illinois is pretty strict on it). But the problem is work. I've spent so long trying to get this job if smoking risks losing it, I don't know if I can risk it. I have thought about talking to my manager face to face to show him how serious about it and that it's not just something to have fun with. I am only 21 years old and fear he will think I'm just some young kid trying to get stoned every hour of my life when it's not like that. During the day while I'm active and working I am fine with the back pain. Staying active and moving around I don't even notice it. It's when I get home and try to relax or sleep at night. It would be simply be a night thing to help me relax and get a good night sleep for the next day.

Anyone who has been in a similar situation I would love to hear what you have to say. And please no comments like "then don't smoke weed". I spent a lot of time creating this forum for a serious medical reason that I would like help with. Once again, any help is appreciated. Thanks.

 

Thanks for the quick reply, that is a good idea and very useful information. So you think it would be the best idea to talk to my manager about it rather than going ahead and smoking and hoping not to be tested? I personally think it's the best way. I feel this will establish a lot more trust with him as opposed to him finding out when I'm in trouble and trying to explain myself.