Why am I feeling this way?

My sister just had a hysterectomy today "the same procedure I had done a year ago" She called me last night and was asking me questions as to what to do to prepare herself for the weeks to come. I told her my experience with everything and gave what help I could. Well today I called my dad to ask him a question about something and asked him how my sister was doing and checking to see if she had come out of surgery. He then told me that my mom was going up there after she got off work to sit and wait for her to come out of surgery and wake up. I instantly got mad and started crying. I live 9 hours away from my parents she lives 2 hours away so yes I understand it's a lot closer, but never once did I get a phone call from them or a visit while I was at the hospital not even after I woke up. I went home the next day and still no call or visit. I feel jealous over the fact that my sister has our mom there for her for the same surgery I had a year ago. I know I shouldn't feel this way, but I can't help it. I haven't seen my parents in a year and a half. I want these feelings to go away. I want to call my sister and not be angry with the fact she has the one thing I didn't have the support of my parents there by her side. What's wrong with me?