First of all, you should understand that I'm not trying to damage your account reputation for no apparent reason ^{[I didn't even tag you until now].} You just woke up from a long period of inactivity and you changed your password immediately, so it's natural to assume you've changed hands regardless of whether it was hacked or sold. There are a lot of shady things being done on this forum including one of them is account selling.

As Radja Rimba suggests, you can prove it by using the ERC20 wallet to dispel this suspicion. I will try to understand your reasoning, it can happen to anyone. Don't be angry, just do it casually if you really are the owner of this account.