There's no problem regarding your visa it will be processed as working visa directly. In our case, we spent almost 2 months processing our papers for formalities here including MOH finance papers, police verifications, iqama, nurse license, medicals, Civil ID...etc...The good thing is your salary computation starts as soon as you arrive here even though you're not working yet or on hospital duty.
Yes, you will still undergo another medical exam once you're here, but free of charge.
Vacation leave here is annually after you had been on duty for 1 year. Just like in my case, I came here November of 2011 (that time annual leave schedule among staffs for 2012 was full already so I had no slot anymore) so they granted my leave come March of 2013. Come 2014, I can request for another leave in any month I want to. They will grant number of days leave from 33 days to 47 days for newly hired nurses. You can also request to have a vacation leave twice in a year but the total wont exceed by the allowed number of vacation leave. Airfare is not free (mine is 190KD round trip), but it is a paid vacation leave. As what I've said, if you're indeed bound for Ministry of Health Hospitals, they will waive any signed contracts there in the Philippines because you will become a regular employee by the Government of Kuwait and by that you can work here for as long as you want or you can resign anytime you want to.
If unfortunately your salary is only 250KD/month (with free accommodation,food and transpo) I think you can still save some as long as you will be conscious enough not to spend more than what you earn. But if you're used to an expensive lifestyle, then for sure it is not enough. In short, it all depends on you. For a quite concrete way of saying this, I can survive here with only 60KD in my wallet. The breakdown would be: 30KD for food and toiletries (I am a male nurse). 12KD for my internet, 5KD for cel phone load (prepaid, here you can use land line phone even if you are calling a cel phone number), 3KD for Cable fee (sharing with your flatmates), 10KD extra for bus/taxi fare. If you will buy gadgets (laptops, iPhone,Ipad,Galaxy Tab/Notes..etc) or will eat in KFC, Jollibee, McDOnalds, or take coffee in expensive shops, it will be another list of budget of course.
Hope this Helps...God Bless us Pinoy Nurses!