When I brought my Meyer lemon in for the fall it was doing great. Started to flower, I tried hand pollinating but all the flowers fell off and now the leaves are getting lighter green and spotty.

Check the underside of those leaves, that looks a lot like leaf miner damage.
Out door trees, when brought inside can have eggs hatch that would have stayed dormant if left outdoors.

Your info doesn't list the area where you live so I can't really  give any specific help.
If you would, go to the control panel and add your location and USDA plant zone so people can give you location specific suggestions.
Thanks

Redhawk

I'm in NY usda 7a long island

I didn't see anything in profile setting to select usda, maybe I'm not seeing it. Kinda new to the website.

Edit I would add I did see some gnat action awhile back but Ithe died iut.

No worries about the zone (I just did a hyphen after state and added it there).

If you can get more light on the leaves of the meyer lemon that should help it recover.
One of the issues I've always had with moving trees or potted plants indoors is bug eggs hatching out.
I have had friends overwater but that usually shows up as browning along the leaf edges and your tree isn't showing that.

It actually looks like it is overwintering well, except for the bug sign.
When you bring it out in spring don't forget that it will need to be "hardened off" (a few hours per day outdoors until it adjusts to the normal surrounding weather will keep shock from getting it).
I plan on planting some citrus trees but I'll be putting up winter houses over them (I'm in zone 8a and if I put up a temp. double glazed conservatory, they will survive our brief winters).
If you were to decide to give that method a try, you can add a heat source to keep the temperature up enough. I've used smudge pots in the past but I may end up building a true conservatory with a rocket mass heater.

The leaf damage I can see could be; leaf miners or white flies.

Bryant RedHawk wrote:No worries about the zone (I just did a hyphen after state and added it there).

If you can get more light on the leaves of the meyer lemon that should help it recover.
One of the issues I've always had with moving trees or potted plants indoors is bug eggs hatching out.
I have had friends overwater but that usually shows up as browning along the leaf edges and your tree isn't showing that.

It actually looks like it is overwintering well, except for the bug sign.
When you bring it out in spring don't forget that it will need to be "hardened off" (a few hours per day outdoors until it adjusts to the normal surrounding weather will keep shock from getting it).
I plan on planting some citrus trees but I'll be putting up winter houses over them (I'm in zone 8a and if I put up a temp. double glazed conservatory, they will survive our brief winters).
If you were to decide to give that method a try, you can add a heat source to keep the temperature up enough. I've used smudge pots in the past but I may end up building a true conservatory with a rocket mass heater.

The leaf damage I can see could be; leaf miners or white flies.

I think ill move a lamp to the area for that and my pepper and yuzu citrus that's great advice I hadn't thought about. The spot they are in is poor lighted west facing. Only gets good light from 1pm and on.

I did harden it off as we had warm/cold spells in fall so it went in and out as the weather permitted.

One guy I know down the road has the greenhouses that I bought the yuzu from. He heats it and has everything even producing fruit in winter!

The one thing I want to say is I wish I didn't use vermiculite (first time ever using it) added to the mix I put this tree in. Because of the volume of the pot and small nature of the tree the damn thing takes awhile to dry. I wonder if that's causing nutrient deficiency? Who knows I'll try the light that had a light bulb go off for me.