Hello.
Rash on face depend on age.common causes are.
1-Allergy,
2-Seborrheic
dermatitis 3-Rosacae
4-
Heat allergy.
5-acne.
6-herpes simplex
many rare causes .
You can take anti allergic tablet(diphenhydaramine ) & lotion(calamine) .
olive oil ,aloe vera,vitamin E,.flucatisone,mometasone,
hydrocortisone creams.
If not relieved for few days & severe ,
consult Dermatologist.
For fatigue & leg cramps, take pain killer tablet(Ibuprofen,Paracetemol,Naproxen) & can apply pain killer gel locally., & masage, apply hot or cold sponging depend on weather.
Take plenty of fruit juices,banana,dried fruits ,coconut water ,dairy products
Consult physician.
Treatment depend on cause.
Feedback to H C M .
Thanks for query.