A lip flip refers to an injection of Botox or other toxin at the upper lip border to try to evert the lip out and give the illusion of a fuller lip. Filler is an injection of hyaluronic acid directly into the lip to increase volume. The lip flip will alter your ability to drink from a cup or straw a little and some people do not like this, but it only lasts up to 4 months so if you don't like it it won't last that long. The lip flip is very subtle and in some people doesn't really give a great result. Because it only takes about 4 units of toxin it won't cost much so maybe give it a try!
I think for what you are describing as your concerns a surgeon is what you need. Possibly rhinoplasty with chin implant. Fillers are an option for the chin projection but it will take a lot of filler and is not permanent. In regards to the nose asymmetry filler will not correct this issue as well as surgery and again is not permanent. In addition, you will need to find a skilled injector who can get you the result you are looking for. I would see a plastic surgeon for consultation.
I have not seen PRP injections work well and there is almost nothing in the literature to support it does. Whatever improvement is seen after the injections are done is short lived. I usually address this with Restylane injections. Works well, results are instant and lasts up to a year.
Yes, you can do them together. In fact I always advise my patient to do everything they are willing to do to save their hair for male/female pattern hair loss. The more you do the better. I like Viviscal Pro, topical minoxidil and PRP together. Females can take spironolactone as well. In regards to PRP effectiveness there is no perfect answer as we all react differently. I have seen some patients not respond at all and some with great results. You need to go in with realistic expectations and results area variable.