Answer:
(Fatwa: 2270/1866=B/1429)
You will be considered mazoor (excused) if you are unable to pass any time of salah in which you can perform salah being pure and clean. You will have to make fresh ablution at the beginning of every salah and offer the salah; the salah will be valid even if urine and wind comes out. There is no need do masah after making ablution, the person who told you to do so is wrong.
You must go to Umrah, but do not wear knickers in the state of Ihram. You should also pray to Allah Almighty to cure you from the diseases, most probably Allah will give you shifa and you will get rid of the troubles. You should wrap up tissue paper while performing Umrah.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
