I would strongly recommend that you see your primary care doctor
. Your complaints are concerning. I would also recommend that you see a dermatologist
(a skin specialist), a the skin conditions you describe are concerning.
Firstly, anyone who is short of breath and has palpitations and has weight loss gives us concern. This suggests there are problems with the heart and possibly the lungs. One problem that ties these all together is an overactive thyroid function (known as hyperthyroidism). This also causes feeling of warmth, diarrhea and changes in your hair. This can cause an irregular heart beat known as atrial fibrillation which can cause palpitations and shortness of breath. There can also be skin changes. This needs to be evaluated. In addition, evaluation of your heart and lungs is needed. Any person over 50 who complains of weight loss needs appropriate cancer screening as well. This would include a pap smear, mammogram and colonoscopy.
As for your skin changes, this could be related or not. What you describe could be psoriasis
, eczema or many other forms of dermatitis (skin inflammation). This could be an infection as well. It requires evaluation.
See your doctor urgently. If your symptoms worsen, it would be appropriate to go to your emergency room. Good luck.