Many have fought so that we could live the lives we lead now. Suffragettes, soldiers, lots of people. So I think the best thing we can do is to make the most of that life and that includes things like enjoying holidays in Barcelona. As long as we don't forget the less fortunate and somehow I don't think you're in any danger of that.

If you're not convinced by the above then consider 1) you will be supporting Barcelona's economy and 2) most importantly, the break will be therapeutic for you and enable you to deal with the health crap better. Hell, they should write you a prescription for it.