If the occipital block worked that one time, I wonder if you have tried lidocaine on the back of your neck?

This comes in compounded and manufactured tubes, and also in patches. I had a terrible time with meralgia paresthetica...this was a compressed nerve from the spine, which goes thru the abdomen and out under a ligament at the groin thigh area. It is sensory only. It was damaged from a C-section many years ago.
It went from numbness, odd sensations to stabbing breath taking PAIN. When the lidoderm patches came out, I tried those and applied where the nerve exits at the top of the thigh and lo and behold in 2 weeks of everyday use, the pain remitted...after many years! It is still in good shape today, unless I expose it to heat, as in a hot bath, or steam room. I get warning twinges then and so I avoid all heat and things are livable for me. It seems so simple, and I guess I was lucky.

There is another thing you can try... because some stabbing nerve pain is ischemic in nature. That is to apply topical magnesium in the form of a lotion to the back of your neck once or twice a day. This is a new product and I use it for tense muscles and foot neuropathy. It even is lowering my hypertension! (the magnesium is absorbed). Magnesium is a NMDA pain receptor antagonist, and blocks pain signals. It opposes calcium at this receptor.

This is the product...very inexpensive and simple to use.
http://www.mortonsalt.com/for-your-h...-epsom-lotion/

It is not everywhere yet. WalMarts has it, and now I hear Walgreens is starting to carry it. It is also online at Amazon.
This product is rather miraculous and a worth a try for you.
Magnesium opens circulation by relaxing smooth muscle in the arteries. It will relax skeletal muscle, too and is good for cramping. But its pain relieving actions are fabulous. I have many people on NT here using it. It costs $5.98 at WalMart.

MSG in food is to be avoided by people with nerve pain. Watch the ingredients in your food. Monosodium Glutamate, stimulates that NMDA pain receptor.

Other foods that may cause burning or nerve pain, are the nightshade vegetables. The peppers, potato and tomatoes all contain an alkaloid called solanine, which can set off sensory problems. Tomatoes especially also are histamine stimulants...and histamine causes burning, tingling in many people. Check your diet for these and
do without for at least 2 weeks and see if your attacks lessen.

If you take an ACE inhibitor for blood pressure? Please tell me.
These release bradykinin which is very difficult to remove and some people have a genetic error and can not get rid of it. It will cause burning and itching and pain anywhere in the skin.
Also another drug family are the statins, for lowering cholesterol.
These drugs have recently been found to damage neurons. I have photos of this damage on the PN forum right now:
http://neurotalk.psychcentral.com/thread197080.html
Research is showing that statins are not safe in any way, and actually kill cells over time. This damage seems specific to people and differs quite a bit...but can affect any place in the body.

Your Doryx is not known for causing neuropathy, but it may cause Candida (yeast) overgrowth, as a side effect.
Have you tried Nizoral shampoo? It will take care of Candida of the scalp.