thanks for your query.
Since you have both diarrhea
for last two weeks and breathing difficulty it may be due to viral infection and super added bacterial infection on that may cause your persistent diarrhea. For that it is better to have a stool culture along with stoll routine and microbiological examination to exclude bacteria, ova , parasites etc. In the mean while you may have a 7-10 days course of antibiotics in the form of ofloxacin-ornidazole
For chest problems i will suggest to have atleast a chest x-ray PA view to exclude parenchymal lesion and pleural effusion
. If anything can be found then you may consult a chest physician for further evaluation or you may consult us on HCM.
Dont frequently take steroids
for symptomatic relief and you can stop benadryl
now until further diagnosis.