ubuntu - Why is Apache running wild and killing MySQL?

Apache has got out of control over the past few days and
made MySQL crash twice. It all started when I migrated a WordPress website over which
also contains a phpBB forum.

I'm not very
experienced in server admin so it's been very difficult for me to pinpoint what is
causing the issue. When I noticed that MySQL was down, I ran TOP and saw my system-load
spike to 98.00. The server runs 10 V-HOSTS all of which receive a healthy amount of
traffic so I was obviously seeing many apache-2 processes
running.

The high server load continued for 10
mins and then it returned to a normal state. I didn't see a spike of network traffic at
this point.

Unfortunately, MySQL error logging
was disabled (it's now re-enabled) so no clues there. But I'm pretty sure it is because
Apache was consuming all resources, so the MySQL process ID was
killed.

My questions are:

Next time this occurs - how can I
identify what is causing the system load spike? Could it be a php script that went
crazy? Could it be a DDOS attack?

Is there a
way of automatically re-starting MySQL when it
crashes?

I have now installed
htop. Could this be more useful than
top?

Here my server
stats:

m1.xlarge (8 ECUs, 4 vCPUs,
            15 GiB memory, 4 x 420 GiB Storage Capacity)

Ubuntu Server 12.04.3
            LTS

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