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Serious sudden buzzing problem

Hi guys, ive been a lurker on the site for a few months now and thought I might ask for your advice.

I lashed out a month ago and bought myself one of the few remaining Musicman Sub basses left in Aus.Besides not being set-up whatsoever when i bought it,ive been very happy with it.Until today.

I haven't played it in a couple of days and found myself with a few hours up my sleeve this afternoon so i picked it up and started playing away.I immediately noticed that it was terribly out of tune and after switching on my tuner I saw that each string was at least a step up.

After tuning back to standard I began playing again and discovered that the first 5 frets of every string now buzz horribly.
My first reaction was to work through the guides within the sticky here and it appears that I have no relief i.e there is no gap whatsoever between the bottom of my string and the top of my fret. Ive never checked this before so I cant tell if this is a change from what it was before.

Im thinking that my mum (or some other member of my family) has accidentally knocked it flat on its back in my room, smacking all the (large musicman) tuning pegs around. Im not sure how long it had stayed in this tuning but Ive come to three possible causes of this buzzing:

a)If the extra tension on the strings will have pulled my neck out of shape?

b)My strings have been stretched out after being pulled so tight?

or

c)Its been really overcast for the last couple of days and the humidity has something to do with this (the last 6 months here in Aus has been incredibly hot and dry)

I had a brief attempt at increasing the relief through my truss rod but the incredible amount of force I had to put on that truss-wheel-thing worried me a little.

i was just wondering if anyone here had any suggestions on what my next course of action should be, besides taking it to the local music store.I plan on doing that but christmas eve is tomorrow and nothing will be open for the next 3-4 days and it'd be great to get it back in action myself before then.

Cheers
 
It seems from your post that the weather has changed, moving from a hot dry spell to something more humid. As that happens the cells in the wood absorb moisture and expand. On an instrument neck, the expansion of the cells causes the neck to back-bow a bit and you may find that you no longer have any relief in your neck.

Don't worry - it's a normal state of affairs. Let Joshua guide you - he knows what he is talking about and is very methodical in his means.