I won't say I am for or against acupuncture. For some it has helped, although the circumstances were totally different. If it seems to help you, by all means then do continue doing it.
Don't know much about San Zao Ren, although Fishinghat, has given you the info on this.
Yes, you can find heat pads at any local drug store. I do agree with this.... Although I have something much cheaper and more effective. We use this in home care, and I use it myself.
Since the patches are wonderful to use when you need to go out somewhere, you also need to read what these patches have in them; some have asprin which indicates you need to watch if you are taking any pain relievers orally. Others do not contain ingredients and they are safe with over the counter pain relievers and your own prescription meds. Therefore, check them out thoroughly. What I use and what we use in home care is simply this: hand towels or wash clothes soaked with water and ring out the water. Place this is a gallon zip lock bag and heat it in the microwave. Make sure you have access to another hand towel to remove it. Fold the zip lock bag in the hand towel and place it on the area which is aching. For me this is inexpensive and gives the best results without using any patches; at least when you are in the comfort of your own home.
Geebers, Don't worry ahead of time if you are going to be 'ok' for getting back to work. Time and patience.....