Blue toes does not sound good to me! In the shower with the
warm water?

No one here thinks you are hypochondrical. We are all used to
odd sensations and puzzling things.

Start keeping a journal of when you have the various symptoms.
How long they last, etc. When this happens what you are doing, or not doing, and what you are eating.

Some people are very sensitive to MSG food additive. But I doubt it would affect the motor actions of fingers like you describe.

People do develop compression at the elbow. But that would not really link to your blue toe episodes. Sometimes a journal clarifies things.