BAD, Bad advice. If you knew anything about myositis diseases you would know these suggestions would NOT control DM. DM cases range from very mild with skin only symptoms or very serious with significant disability and permanent muscle loss as well as possible lung, swallowing, cancer, and heart complications. Dysphagia is common in severe cases due to muscle damage.
Immune suppressants do have many bad side effects but not everyone has those and there are newer treatments that are biologics or IVIG in addition to traditional ones: prednisone, Imuran, methotrexate,etc.
Some of your suggestions are good for general health and well being but I don't want to argue that. Myositis (except for inclusion body myositis) requires treatment in the vast majority of cases to prevent permanent damage and serious complications. The sooner you get the immune system under control the better the patient's chances for going into remission and avoiding permanent muscle damage or organ involvement.
Not seeing a rheumatologist or neurologist and not being treated is definitely playing with fire. I know 00s of DM patients personally and most do get their diseases under control but some do not.
Earlier I suggested that the poster go to the TMA site where she will find patients with DM, PM and IBM who can give her advice based on their experiences with myositis. I hope she/he has done that because there are many great and knowledgeable people on that site and many resources to study. TMA also has a large medical advisory board with doctors and researchers from all over the world. MDA is another good resource and DM and all myositis diseases are considered in the muscular dystrophy family.
Support group leader for TMA
MCTD (SLE Lupus, polymyositis, scleroderma). Diagnosed 2005. Kidney, liver, GI tract, dysphagia, raynauds, barretts esophagus, quadriplegic in 2005. Recovered and now active in downhill skiing, golf, hiking. Meds: amlodipine, benezapril, omeprazole, potassium, folic acid, vitamins, maxide.
Remain Optimistic and you can overcome.