Jo I missed quite a lot of stuff while I was staying with my daughter
because of the break in my footi dont know if I saw this I have a
feeling I might have sent purrs but anyway another armful of hugs
and purrs for your Brother, and you and your family    Jean. P.

Depends on the amount and where it is. That won't necessarily involve
surgery.  Inserting tubes into the chest for suction drainage is a
routine procedure, which can be done at the bedside. They aren't painful
while in position, although, from personal experience, any physician who
thinks it's OK to pull one out without a local anesthetic should have
one pulled from HIS chest without a local anesthetic.

As far as the BP, there is a part of the brain called the baroceptor,
which regulates pressure; there's also a certain amount of control
(simplifying a bit here) from the kidneys.  It's sometimes necessary to
hold the BP down artificially until the control mechanisms reprogram
themselves.  Hard to guess exactly what's going on here without more
information, but people can recover from everything described.