I feel so alone...

I know I'm not alone but I feel so alone lately. I'm only 23 years old and my husband and I decided to foster a little boy a year into our marriage. We had prayed about it and felt like it was what God wanted us to do and I still feel that way but sometimes I get discouraged. It's been a struggle raising him. We're working towards adoption and we hope for it to be official in July. We love him with all our hearts, he just gives us a time! He does really good for a while and then BAM! He has almost a full week of bad days. He's not a bad kid, he's actually a sweetheart! Let's just say, when he's good he's good but when he's bad he's bad. LOL I have spent many days crying over him and praying to God for strength. Lately, I feel numb to it all. I feel hopeless, at the end of my rope. He had a bad week at school last week and didn't start off this week well at all. His teacher said that he is very disrespectful and whines when he wants attention. He had been doing better at home but obviously it's total opposite at school. They just diagnosed him with ADHD and ODD. I believe that God is our healer and that He can take care of both these problems. I'm just getting so tired of everything. I feel so alone. I just recently quit my job so that I could focus more on college and raising him. Because I'm not out and about, I get discouraged and feel very alone. I need prayers desperately! Any advice on parenting would help too. Thanks and God bless!