If you have one autoimmune condition and it runs very strongly in your family what are the chances of getting more?

Unclear. : There is a syndrome called polyglandular autoimmune syndrome type 3 that involves multiple autoimmune diseases (hypothyroidism, dm, psoriasis, lupus.....). You may still get one or none depending on your family tree. There is a genetic link with diabetes type 2

This depends : Autoimmunity is a manifestation of excess immune stimulation leading to inflammation of your tissues- myelin in ms, joints in ra, skin in psoriasis... Your immune stress can be environment edible, infectious... Plus other stressors contribute- poor diet, lack of sleep... Genetics play roll therefore the same metabolic problems can manifest in various ways. Keep your int & ext environment clean.