Freda I noticed you mentioned you are due to see an endocrinologist next month because of an underactive thyroid.
As long as you have depressed thyroid function you will tend to gain weight, because your metabolic rate will be low.
I was diagnosed with hypothyroidism in 2005. My weight had been gradually creeping up for years, partly due to this.
Eventually I have lost 10 kg, I'm 5'8" and size 12, but it's taken me 2.5 years and I've done it mainly as Nankate and Aka suggest.
I've never investigated meal replacement shakes - I find the idea of artificial food repellent, and they can't be a long-term solution.
You can lose weight, but it will be easier once your thyroid is sorted out, and the only healthy way to do it is to eat properly, exercise more and above all accept that it's going to take years, not months, there will be times when you put a bit back on, but you'll get there in the end if you persevere.
Good luck 