I have a huge history with MN. I have (had) two in each foot. I have had nearly every conceivable treatment (orthotics, metatarsal pads, cortisone, alcohol sclerosing, shockwave therapy, cryosurgery, traditional surgery, and lastly, removal of the stump neuromas and implantation of the nerve ending into the arch muscle). The reason I had to have the final surgery was because due to the non-sense practices of a podiatrist (many in the US do it the same way which is wrong) who did the traditional surgery where he simply cut out the neruomas and left the nerve ending to find it's own home left me with new stump neuromas, which are worse than the original condition. When they just cut out the neuroma, the nerve ending will try to grow back to where it was, and when it does, it usually meets scar tissue. It will try to grow into that scar tissue, but it can't, this a stump is developed. The last surgeon (a peripheral nerve surgeon) had to remove the stumps and implant the nerve endings into muscle, so they would stop growing.
Betty is correct in recommending MN decompression (that's the name of the procedure here in the US she had done), and that's usually what the peripheral nerve surgeon would have done for me, except that I had stumps that we had to deal with. So, if you have to have surgery, find a doctor who is well-versed in decompression of the nerve. This saves the nerve, but it cuts the tendon. Both seem drastic, but I would opt for keeping the nerve and cutting the tendon and avoid all the pain that comes from nerve damage/amputation and the phantom pains (which are very real) too.
Good luck to you. If you would like to find out more about the various options and treatments for MN, please visit www.MortonsNeuromaTalk.com. -TJ