Hi, welcome to our site. I am Dr Saumya Mittal, MD. Read your query. That is a very significant question and i appreciate your problem. I will try my best to answer your query The fact remains that you can change from lantus to long acting plain insulin. This should be able to help you control your sugars at much less cost. There is no point in skipping medicine for cost reasons when the alternatives are present. And if the last insulin is not good, you might as well change the insulin. However I wish to know how you keep your insulin cool. It has to be kept in the refrigerator door, to maintain the potency. The insulin gets denatured in heat. Also, for your chest pain, I will suggest an EKG. This is the basic minimum needed. I hope this helps you. Inform the reports mentioned above/if any other so I can be of help further. I have given you the answer to the maximum considering the information provided. The results of the tests could further enhance my answer to you. Please do understand that some details could be extracted from a detailed history and examination. Please feel free to ask another query. I would be glad to help you. Looking forward to your return query with the details asked so that I can help you further. (If the answer has helped you, please indicate this) Best of luck.