What is the ruling on prayer for one who suffers from excessive flatulence, repeatedly renews his ablution, and is unable to attend the sermon? And is hijama beneficial in such a case?

Fatwa No. 93006 clarifies what one afflicted with excessive gas should do: there is no need to delay the Jumu'ah prayer or the opening takbeer. It suffices for him to perform ablution after the time for prayer has begun and then pray. As for hijama (cupping), it is a permissible and beneficial treatment, so there is no objection to its use, as it may have an effect in healing. You may consult a trusted physician or the consultation section on the website, along with making supplications.