in my bed (also in baby)

when tyler had his jabs on monday he was restless for 2 nights. On these nights he would wake and not settle again. I ended up putting him in bed with me for peace sake. I was tired & so was he. Now though he is really pushing it. Waking up at 3am & crying till I put him in my bed. Which last night I did. I KNOW - DONT SAY IT! I SHOULDNT of done it. but i am so exhusted with Isaac who wakes in the night & is usually in my bed by 4am and I am currently getting up to get J up to go to the loo as we have started getting him dry in the night. So it just seemed like the final straw when Tyler woke up. How can I get him to go back to sleep? Dad is not an option of help although he might see to Isaac in the night. HELP - Im sooooo tired!