First chseck B.P.Rule out Hypertension
. you told ,after some bread pieces, u had improved.so it may be Hypoglycemia
.So keep frequent meal rather than fasting.Check Blood sugar.Yor heart beats are fasten, it suggest that your are very hypersensitive person.So relax.you looks nervous.So take some anti anxiety
medicine.If B.P.,Blood Sugar,E.C.G are O.K.your arms and leg muscles are not weak then do n't worry.