Best of luck, my friend. I hope that sorts your issue. If it doesn’t, please consider calling a qualified electrician.
Stay safe and keep thumping!
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I’d start with one of these
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A receptacle tester is an inexpensive tool that’s handy for everyone to own. In an old house I lived in, I discovered that the receptacles in one room did not have ground wires hooked up to them. Power bars can be dangerous when ungrounded as a short in one device can cause electricity to travel along the ground to other devices plugged into it.
Musicians have been killed by shorts/ground fault in amps, tube amps can be especially dangerous due to their higher voltages.
One should never use an amp or any other device that is giving them a shock.
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People used to get electrocuted by live-grounded TVs all the time.
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That’s now how you want to enjoy your “live” shows 
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