Hi again @Alias953
So sorry to know that! 
Do you have your phone updated? Or even Google Play apps you may have downloadead? It´s always advise to keep them up to date to assure you always have not only the best features, but optimizations!
At first, i recomend you to boot your phone into safe mode! By doing so, you can check if any third party applications might be involved in the battery drain!
If you notice the same problem, try to repair your device via Xperia Companion? Please note that all your date will be lost (not the one present on an sd-card if in use). If you do this, the phone takes some time so settle!
Let me know how it goes 
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