Got it. I'm still going to recommend you read Simple Wealth, Inevitable Wealth. Actually, I don't know if I mentioned it in my original response - I think I know which person you are, but we aren't given information about who asks what unless you send me a link. If I'm right, what would help the most is to sit down with a fee-only CFP(R) who can give you specific advice and help you make some decisions going forward.
So sorry about losing your wife - sounds like a sweet love story and you are pretty lost without her. You both did a good job of saving and now it's even more important to have a proper allocation and help with managing your investments. Most advisors would tell you to immediately get out of stocks, but I would prefer you to have a plan first and then a well-balanced equity mutual fund portfolio for money you will not need for 5 years or more. That requires planning. Done properly, you will not "lose" anything when the market goes down again, because you will not need to touch it - you'll have your 5-year needs in cash and can ride out when others are panicking. The book above will really help you understand why this works and take the edge off your fear.
Now back to your original question - depending on your physical condition and projected lifespan, it is usually better to wait at least until 66 to begin drawing Social Security. I will be 58 one week from today and I plan to wait until age 70 if I am in good health. Should you remarry, you will also leave a higher benefit for a surviving spouse. However, if your plan shows that you need it sooner, that is a factor that must be considered.
If you can live on $3,000/mo, you may be able to retire soon, but I wouldn't recommend it without a plan first. Sorry to keep harping on it, but it can make such a big difference and if you want to retire, I see no reason not to try to work it out.
Good luck and I hope this helps!