Hi Angela
So very sorry to hear about your father.
It would be very hard to comment on people who are having chemo unless you know what type of chemo your father was on.was he on any special trials.
To be on the intensive chemo he must have been deemed to be fit,as your are boarder line at 65.How many cycles of chemo were given .
DVT are a side effect and can effect any part of the body,although many start in legs,blood clots are something that can develop,infections also.All are life threatening when on chemo.
Not having a lot of information,any body would be second guessing,
I know this must be a terrible shock for you,and you are angry about the way things have turned out,but when you have Myeloma you do not have much choice,you either treat it and buy time with all the dangers, or you do nothing very sad but true.
I am sure your dad would prefer you to mourn him,and not second guess the situation ,My sympathy to you and your family.Eve
At least your father tried to buy time.