Please suggest any idea how to gain facial fat, it apears if I loose weight, only thing happens is my face becoming thin?

No good way. Besides more invasive or surgical interventions to spot volumize. If you overall gain weight you will eventually gain weight in your face. But this comes at the expense of likely gaining weight elsewhere.
Only by injection. Sadly, this type of fat loss is not easy to reverse. You can only do it by gaining a lot of weight, which is probably not what you want. A qualified aesthetic physician or surgeon can inject fat harvested from another area of your body into your face, but about 70% of it will eventually be resorbed without stem cells. Some fillers (HA, Sculptra, Radiesse) can provide temporary volume. NO DIY!