You need to see your primary care physician to determine what is going on with your pain and whether you need further evaluation with a specialist in spines.
The fact that you had a broken collar bone a few years ago and still suffer from pain from that and now this new injury that feels like it is affecting the sciatic nerve going down your leg, says you need medical attention to determine what is actually going on.
Ice is used for the first 24 to 48 hours after an injury and then it is heat.
Other than using those 2 things, you should not be doing anything more but seeing a physician.
Trying anything else on your own, including exercises, intensive acupuncture or an acupressure mat is not appropriate, without knowing exactly what is going on and is wrong.
Doing the wrong thing will increase pain, and possibly further injure your body.
It is never advisable to self treat beyond the very basics. It' is most important to seek medical attention first and medical attention from the appropriate doctors with and MD after their name.
Fran