Seems the genius that wired my house has to many things wired into 15 amp breakers and i have 40 amp breakers that are empty can i use 40 amp breakers to power lights and receptacles as the way it's set up now i keep blowing breakers everytime i make a pot of coffee and run the microwave or if i turn on lights and run the microwave there are 2 separate 15 amp each with 3 wires running off them to different zones of the house Any help would be greatly appreciated

So, LONG story short(er), we started having flickering lights in the house a few days ago. The flickering was house wide, not just in one location. We've never had this problem and it is located throughout the house. last November we had our 25 year old meter and pedestal die in the front yard and it was replaced. We have not had any problems since. I initially called the electric company to ask them to send a guy out. This was after hours but the on call guy said he "pinged" my meter and found it to be working exactly as expected. He said he also checked my neighbors meters that shared service with me and they were running normal as well. He scheduled a guy to come check the meter itself the next day and they found it to be working as expected. My next call was to the electrician that installed the pedestal. He came out the next morning and double checked the meter, then spent almost 2 hours looking at the panel, checking the tightness of every lug and breaker. He checked the power coming in with the furnace off and on with his meter, checked it at random intervals, and inspected the wiring overall. He found some looseness in a few of the lugs and found one breaker for some bedroom lighting that was quite loose. He said the connection was not burnt but had minor evidence of some heat. He tightened it back up and said that may or may not have been the problem. He said this was warranty work so there was no charge. We had lights on while he was here and after his work we didn't see anymore lights flickering. This was about 11AM when he left. However, at approx. 10:30 PM my wife started seeing the lights flickering again. I noticed this as well at 6AM. It doesn't appear to be tied to any appliance but the only one thats been confirmed is the heat pump. I turned it off and on at the thermostat while the electrician was here and everything was normal. Side note - It has been very cold here (single digits - colder than normal) if that has anything to do with it. The power company has washed their hands of it since everything on their end is fine. The electrician says it may or may not be the aluminum wires in the yard, but I watched him prepare and connect the wires in the yard to the new pedestal and they looked good. We are not able to afford a major electrical job right now so I'm trying to find out any possible solutions to this problem. Any assistance in solving this mystery is appreciated.