The simplest and best initial treatment for a neuroma is a neuroma pad. You may have seen this described as a metatarsal pad. Either way, the idea is pretty simple.
If you place a teardrop shaped domed pad underneath the metatarsal bones in your foot it will actually decrease some of the pressure on the nerve but it will also lift and separate the metatarsal bones to spread them apart slightly. You can order these pads online.