Desire to go for Umrah again

I've just gotten back from umrah on the 26th Feb. Subhanallah, I have never felt so much at peace when I was there, especially being in Musjid-e-Nabawi. Being there I did not feel any pain in my body (cancer), not a single worry was on my mind. My problem is that since coming back home, I have become sad and crying most of the day. I crave and miss to be there. I do not want to be here in my own country. I feel that when I was there, I did not do much ibadah, time was wasted as I was just learning ways over there. Is there any dua that I can make to increase the chances of Allah inviting me back there? I promise myself that if I get to go there again Insha Allah, I will not leave any time wasted like I did before. Is there any way for Allah to grant me death in Madina or Makkah? Or is it wrong for me to make dua like that?