I am suffering with blisters in mouth and pain in joints and doc told me my red blood count is getting down what should i do

Patient: I am 52 yo i am female i am a diabetes patient and i am also suffering thyroid and high bp within 10 to 15 days i got blister in my mouth

Symptoms: I suffer swear pain in my joints and i feel tied all the time and i can’t sleep properly, i feel to much weakness problem please give me advise what should i do