hello, travelling together with anyone can be a difficult experience, and I do know that a couple travelled os and were very close still after many years of marriage, but their trip made their relationship a shaky one, although now they have settled down again which is good.
The problem was that being in a foreign country only one of them could speak their language, and if for some reason they were split up then this made it so much harder for the person who couldn't speak that lingo, and so in any desperation she found this to be very difficult and she didn't suffer from depression and that includes bipolar.
The idea of travelling os seems a great idea months beforehand, but as the time creeps closer and closer then your bipolar kicks in. This happens to me as I have OCD, and I make plans to do certain things in the future but as time gets nearer then I start to panic, to the point that I then try and find a way of how to get out what I have promised.
I gather that your husband maybe making all the plans, so you go to them whether you like it or not. This will build up the pressure on you and to your marriage, being taken here and there, with his promise that you will love it, but most times you don't, you just pretend to like it, but this only creates havoc with your depression, and in time it may make you fall back into the black pit.
How do you sort this problem out, well you could ask your husband to go and see what he wants to see by himself, then this will relieve time by yourself, or just say 'time out' for a few days, ' I need a rest hubby' but go and do what you want to do, 'I will be OK'.
One thing not to toy with is that you could have spent this money at home, the decision was made and that was past tense. I hope that it improves for you and please keep in touch. L Geoff. x