Susie,
I am so sorry that you have to face this challenge at so young an age. You probably are not familiar with clinical trials, their goals, and so on, and I think it's unfair to throw the decision into you lap this way.
READ the protocol for that clinical trial. Aloud. It is an early trial, so it has no track record. For myself, I would rather try a more tested regimen before going into a trial. I assume the doc has staged your case with testing for distant metastases. A careful doc will retest you after you have been in chemo to see whether there is a "response." If the drugs are not working, then maybe, but only maybe, you could enter that trial. Read it. So many trials want "virgin" patients and won't take a previously treated patient.
As for longevity, sigh, who knows? It's probably best to plan for the worst and hope for the best. Getting some planning done, in writing, may help you to get on with your treatment in the best frame of mind. For example, make serious plans for your daughter, and then put it aside and pay attention to yourself.
As for QoL, we are talking about toxic drugs. There is no free lunch, although some "recipes" are better than others. The only one of your drugs that I have taken, and not quite that one, is paclitaxel. I had docetaxol (Taxotere) and did well with that. The platins are tough drugs, I think. But, hey, the docs have wonderful drugs for side effects now.
Are you losing weight because you are not eating, or what? Is your doc treating you for that possible upper respiratory infection? Ask the medical people the tough questions. Make them track what is happening. Chest x-ray?
Good luck,
Alma