It’s hard. Here are a few tips:
1. Put money in the pushka at least once a day for his Hatzlacha
2. Daven 1 tefilla (shmonei esrei) and talk to Hashem like your friend.
3. Ask your husband to call you twice a day. He will call you during his free time. If he calls, don’t call him. If he doesn’t, keep your outgoing calls to a minimum (2 calls).
4. DO NOT call your husband a million times – unless it’s an emergency (but a true emergency that he would have to come home).
5. Keep very busy. Especially at night. Go out with friends or talk on the phone or watch something. The idea: distract yourself. Nights are hardest.
Good Luck. Keep strong.