The behaviour of men is a bit different when they are in difficulties. Men want to put up a front of strength and resilience, more so in front of their wives. If their status as providers for their family is under threat, they may hide it from wife.
Now, don’t ask why men are like this. That is a lengthy answer. Just accept it.
In your case , since you say your husband is in a financial mess, he must be in a “shut down” state. Your sence of loneliness is genuine, because husband may be concentrating more on his finances than family. Sort of taking you for granted.
The best thing you can do is support him unconditionally, even if he has made idiotic blunders, possibly against your advise.
The worst thing you can do is have an affair and put one more worry in the lap of your husband.
So just relax and let him solve his problems, help him in finances if he needs it.
Keep telling him how great and handsome he is......... even if you feel otherwise.
Next Steps
Even if yours was a love marriage, take a long term look at life with your husband. If you think life with him may not give you , the type of happiness you want, then look for other options . Keep the life of your young daughter in mind, while weighing options.
Health Tips
Giving a back rub to your husband , when he comes home tired , can work like magic. Try it , it can trigger reciprocation from your husband . Very rarely men can stop at giving only back rub to their beautiful wives. Look a bit sexy, smell a bit sexy and talk a bit sexy when you start this exercise, and enjoy the aftermath.