becoming increasingly frustrated

Hello again all. I have been extremely frustrated with my weight loss. I had my surgery on Feb 5 2014 so I am a little over 2 months po. The first month from the time the Dr recorded my weight until he seen me 1 month po I dropped 34 lbs. I was ecstatic. When I went in for my 2 month check I only lost 7 lbs taking me down to 226. That was on April 7. Since then I have dropped 8 lbs in the last 2 weeks. I work out at least 5 days a week doing 45 mins on my elliptical and then lifting 10 lb weights on top of it to get my arms in shape hoping some of the skin will stretch back. I eat healthy getting 60 grams of protein daily and plenty of water though sometimes I may be a few grams short on my protein and a little short on fluids. Why am I not losing more weight then I am? It just doesn't make sense to me. My Dr was upset with my at my last visit for not dropping enough weight. I see so many people hitting the 100lb mark before a year and I can't figure out what I'm doing wrong. I plan to start tomorrow walking 4 miles a day like I was before I got the elliptical a couple weeks ago on top of everything else I'm doing. Can someone please help me or guide me so I can increase my weight loss?