Female, & I Am Aged 66yrs.General Background: I Have Experienced

Female, & I am aged 66yrs.General background: I have experienced excessive High Blood Pressure, Type 2 Diabetes, Atrial Fibrillation, (treated for yrs & controlled to varying degrees) and recently diagnosed (confirmed by biopsy) with Lichen Planus (Mucosal). I also have a great deal of difficulty with excessive sweating (body heat, without a fever or raised temperature). In general doctors have tested for numerous diseases but have shaken their collective heads and washed their hands as, "Go away and live with it, we can't help you!" Not very helpful nor satisfactory I assure you! I believe there is some correlation to health issues and diet...can you direct me to clear (layman's) information concerning dietary relief for the L'P'and the Sweat issues? Thanks , I G D