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Thanks. If I had bid 1NT, presumably North would have bid 2♣; how would the auction have gone from there?
If you open 1nt, west would be psycho to double (then again he doubled 1d so it already proves he's psycho, as gwnn said I forgot to say how nuts this is).
Semi-Normal bridge: 1nt -(p) - p, then East if he has gadget to show both majors does so, and e-w play spades for +200. I think it is hard for them to bid the game after both pass initially. Most would open the East hand in third position.
Psycho bridge: 1nt-(x)-?
Now this depends on your agreements over the double. I think it's best to play systems off over a penalty double though if you play "SAYC" verbatim to the notes, systems are on and 2c is still stayman so North can't bid it. If systems are off, North bids 2c to play, and East wonders how the hell west can have a penalty double of 1nt having passed initially

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Let's pretend you are in first seat, so that it is vaguely possible for everyone to have their bids. After 1nt-(x)-2c, you should almost never raise this. This is because 2c only promises a weak 5 cd suit, could be xxxxx and nothing else, promises a much weaker suit than 1d-(x)-2c, and is just an attempt to get a lower penalty than 1nt-x (since long suit will score tricks as trumps, and provide entries for leading toward the strong hand, but opps could hold up & prevent these tricks in NT), also the opps may bid over this.
The suit has to be stronger over 1d-(x) because:
- the double over 1d is for takeout, not penalty. So East will usually bail you out by bidding even if 1d-x happens to be in trouble, and you're only at the 1 level anyway. There's no strong reason to mention clubs unless it's a good suit.
- unlike over 1nt, where you can count on doubleton support at least, and frequently 3 or 4 cd support, there's no such guarantee over 1d. So logically your suit has to be stronger, opposite no guarantee of support & raising level of contract.