Hello and welcome to Ask A Doctor Service. I read your question and here is my answer. It looks like you have a postural drop. From how long you have diabetes and is it well controlled? If u have diabetes from a long time and have not a good control then may be you have develop autonomic dysfunction, one of the complication of diabetes. You need to check your b.p while lying, sitting and standing. Talk to your doctor about this and he will examine you for postural drop. Hooe i answered your query. Feel free to ask if you need further assistance. Thanks. Regards. Dr imran zeb. G.P