I just left a toxic friendship but i feel very sad about it i know leaving the friendship was best i still feel lost are there any tips on how to move on from this?

Any relational changes can lead to grief. Grief is important to experience and work through as it will help you process feelings and prepare you for the future. There is no quick way to get through grief. Make sure to give yourself plenty of time to process, maybe talking to another friend or trusted professional can help.

Time is the best healer in such cases. Planning ahead and staying involved in activities that are demanding as far as attention, but rewarding overall may create the space for healing.

It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!