Is it safe to control diabetes with diet and walk alone?

Hello doctor,

I was feeling angry and very consistent in the urine. I decided to check my blood sugar level. I was in fasting regularly. Meanwhile, I was under extreme stress pressure due to my job problems, I consulted with the doctor and checked the blood sugar level, and it was 391 with fasting which was shocking to me, then I tried some precaution and avoided to take tension and food which is generally known bad for people with diabetes. After four days I rechecked my blood sugar, it was 246 mg/dL, and the third time it was reduced to 194 mg/dL. After this doctor suggests me Hb1ac test and the value was 14.9 against 4.4 normal amount, and he gave me some tables which made me in trouble with an extremely high gastric issue which I stopped to intake immediately. After that I decided not to take the medicine and try to control it with natural way, i.e., walking or jogging, avoid taking tension and diet control, now I feel healthy, and my blood sugar is between 100 to 130 mg/dL which I am regularly checking since last 10 days. Meanwhile I consulted with a lot of doctors for treatment or getting right knowledge about type 2 diabetes in order take some right decision for treatment, but still I am confused because all doctors have difference in opinion which made me more confused, some are saying I should start tablets immediately, a doctor said I must start insulin otherwise I may have some serious issue with kidney, some are reporting insulin is last stage treatment etc. in my opinion they all are thinking according to their studies, and no one is taking care of my opinion i.e., my blood sugar was high at my worst time once I understand that I facing issues regarding blood sugar and started preventions it is under control somewhat, now my question is what should I do, if my diabetes is under control with walk or diet control should i take medicine or insulin. Please help and guide accordingly.