Just starting again

First of all, let me explain a little of my background.  I am a 28 year old with High Blood Pressure.  I inherited this from my father (Thanks Dad) and started to take pills to control it.  I also want to say that my weight gain has contributed to this too. I got too comfortable about 5 years ago, taking an office job and getting into a relationship, which I'm still in.   I went to the Dr's today and he said that my blood pressure is under control, but I need to really start to think about a weight loss plan.  I got a B-12 injection and started taking Phentermine (appetite suppresant).  I know Phentermine makes your BP higher, so I'm plan to take my BP pressure at home  every day.  I have friends that have taking the B-12 and Phentermine and have lost so much weight.  I have been obese for over 5 years and of course have tried every diet under the sun as most of us have.  Always made an excuse for why I never stuck eating healthy.  When I make an excuse the only person that I am lying  and cheating to is my self.  So I ask my self, why am I still obese?  I don't really have a good answer, but have more excuses.  I love myself inside and I am happy with my life.  I am not happy about how I've let myself go.  I can lose weight, but the hardest thing is to keep it off.  I have to acknowledge that this is a lifestyle change.  No if ands or buts.  I thought writing how I feel will help out  so I starting this blog.  Feel good already!  I'm ready for a lifestyle change!