Oh, how I can relate!
the ever shrinking airplane seat and ever expanding passengers...I have been literally molested by some passenger's bottoms spreading under and over the seat divider on some domestic flights. Once, on a business trip, one of my co-workers who is of a certain size, suggested to "lift the arm rest so we both have more space". It is so much easier to say "heck no" to a stranger than to your co-worker, LOL. On one flight I had to tell one guy who got very close to me that we are probably married in few cultures by now. I am so sorry you had to endure this uncomfortable flying conditions.