Anybody have something like this?

Basically if there is a big life change possible I end up in bits, negative thoughts roll in and all the panic attack symptoms kick in.

Example 1 - saw a lovely house in country - wanted to buy it on day 1 - by day 5 it was not happening via a nice series of panic attacks.
Example 2 - job changes - have good opportunities but too scared to even look at them in case I have to go ahead with it. Panic attacks, anxiety, low self-esteem and depression.

When I start thinking about the change initially (while its a fantasy and safe) I can be all excited and positive. Then when it starts getting closer I start looking for every possible thing that can go wrong with the anxiety.

This ring a bell and did anyone get through something similar?