Hi there, I really do know how you're feeling. I have ON, (Occipital Neuralgia), TMJ (Temporo mandibular Joint Disorder) MFPD (Myofacial Pain Disorder) I feel like I've been whacked in the back of the neck with a baseball bat, The pain is 24/7. I have shooting pains and an inflamed feeling all over the head. A clickety clack jaw and sore eyes. Not pretty. I really empathize with you.
For home use, some people are prescribed lidocaine injection medication and syringes. The most common reason for this prescription is to treat a source of chronic pain, which sounds like you are a candidate for this method. The medication may be effective in this respect, but it can sometimes be easy to overdose and use too much. When this occurs people should get to a doctor and watch for any signs of potential overdose like strong pain in the chest or changes in heart rhythm. I suggest you talk to your doctor who gave you the injections and see if this is an option suitable for you. I've had this combined with cortisone injections but only had very short term relief. Like 2 hours.
I hope you can get relief very soon. :+)
I'm interested to see how you go.
Best of wishes