My 2004 Honda civic lx 1.7 is leaking coolant and builds up a lot of pressure?

I have changed the thermostat, thermostat sensor, radiator, hoses, and new fans. There is no antifreeze in my oil nor is it leaking from the exhaust and my car sounds and runs great but I've noticed that when it is parked for the night and I go to check it in the morning there is no coolant And it'll sometimes have a lot of pressure built up and spray coolant out? I've also noticed coolant all over the front of the breather and my fans but I can't find the leak anywhere I've made sure hoses are tight radiator isn't clogged and I've gotten test for head gasket but nothing can someone answer the question to my mysterious coolant leak? I can also drive it for about 2 hours then it'll start to over heat but as soon as the temp gage goes above half way marker I shut it off and let it cool and refill with coolant. Please help! Some mechanics I've been to haven't been of any help

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