Hi Mat,
Morton's neuroma are not a true neuroma but a swelling of an intertarsal nerve and thickening of the tissue around it. This is usually from a mechanical cause. True neuromas and neuroma-in-continuity are different. Nerve tumors such as schwanomma are different still.
I'm not saying you shouldn't get an MRI but maybe rest easy that your feet are not necessarily an indicator of a systemic problem.
Sadly, I had to learn a lot about these guys after having a true neuroma form after a nerve injury.