Extremely unlikely Republicans lose the house. Trump would have to lose by at least 6% if that happens, more likely 8% or higher for that to happen. Senate will likely be 50/50 or 51R/49D so who wins the presidency will matter a lot for tie-breaker.
It doesn’t matter at all which Party “controls the Senate.” At least 10 Republican Senators vote with the ‘Rats on almost every issue and the Republican Speaker of the House may as well be a ‘Rat.
Trump wins or this country is done. Finished. Kaput. Fini. Congress is irrelevant.