Sat was my first time having cravings since being out of treatment and with everything in me im still sober with same cravings and getting worse. Its a struggling fight right now for me.... im a fighter for what i want and believe in and man i feel the weakness coming little by little.
When i first got sober I took naltrexone. Its specifically for cravings. It worked pretty well
Ask your higher power and help will be on the way, in fact, He knows you are struggling so give it 24 hours and tell us some great news 
Use the tools that they taught you in treatment. You are reaching out here. That's awesome! I know going to meetings definitely works for me.
You get busy asap, get today gym as it is good for anxiety and helped me for many years. Get doing everything you can do for you. Make sure you ask God for help as soon as you wake up. God's will for you is not to use. God's will be done)
Praying for you
I know the feeling. It gets easier. Go to A.A. and stay busy. Boredom is your worse enemy.
Stay strong!
Do things that strengthen your mental health and sobriety!
What helps?